Command "sudo apt-get update" runs with some error

I am new to Ubuntu. I am facing some problem running the sudo apt-get update command. It shows the below mentioned error.

My system configuration:

• Ubuntu 12.04 LTS
• 32 bit

Command:

sudo apt-get update

Error log:

   Err http://security.ubuntu.com precise-security Release.gpg
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise Release.gpg                                      
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates Release.gpg                              
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Ign http://security.ubuntu.com precise-security Release                                 
Err http://in.archive.ubuntu.com precise-backports Release.gpg                             
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Ign http://in.archive.ubuntu.com precise Release                                           
Ign http://in.archive.ubuntu.com precise-updates Release                                 
Ign http://in.archive.ubuntu.com precise-backports Release                               
Ign http://security.ubuntu.com precise-security/main TranslationIndex                    
Ign http://security.ubuntu.com precise-security/multiverse TranslationIndex                
Ign http://security.ubuntu.com precise-security/restricted TranslationIndex                
Ign http://security.ubuntu.com precise-security/universe TranslationIndex                  
Ign http://in.archive.ubuntu.com precise/main TranslationIndex                             
Ign http://in.archive.ubuntu.com precise/multiverse TranslationIndex                       
Ign http://in.archive.ubuntu.com precise/restricted TranslationIndex                     
Ign http://in.archive.ubuntu.com precise/universe TranslationIndex                       
Ign http://in.archive.ubuntu.com precise-updates/main TranslationIndex                   
Ign http://in.archive.ubuntu.com precise-updates/multiverse TranslationIndex             
Ign http://in.archive.ubuntu.com precise-updates/restricted TranslationIndex                                                   
Ign http://in.archive.ubuntu.com precise-updates/universe TranslationIndex                                                     
Ign http://in.archive.ubuntu.com precise-backports/main TranslationIndex                 
Ign http://in.archive.ubuntu.com precise-backports/multiverse TranslationIndex                                                 
Ign http://in.archive.ubuntu.com precise-backports/restricted TranslationIndex                                                 
Ign http://in.archive.ubuntu.com precise-backports/universe TranslationIndex                                                   
Err http://security.ubuntu.com precise-security/main Sources                                                                   
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/restricted Sources                                                             
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/universe Sources                           
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/multiverse Sources                         
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/main i386 Packages                         
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/restricted i386 Packages                   
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/universe i386 Packages                     
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/multiverse i386 Packages                   
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/main Translation-en_IN                     
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/main Translation-en                        
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/multiverse Translation-en_IN               
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/multiverse Translation-en                                                      
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/restricted Translation-en_IN                                                   
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/restricted Translation-en                                                      
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/universe Translation-en_IN                                                     
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://security.ubuntu.com precise-security/universe Translation-en                                                        
  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/main Sources                                                                          
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/restricted Sources                                
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/universe Sources
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/multiverse Sources                                
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/main i386 Packages                                
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/restricted i386 Packages                          
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/universe i386 Packages                            
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/multiverse i386 Packages
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/main Sources
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/restricted Sources
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/universe Sources
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/multiverse Sources
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/main i386 Packages
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/restricted i386 Packages
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/universe i386 Packages
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/multiverse i386 Packages
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/main Sources
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/restricted Sources
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/universe Sources
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/multiverse Sources
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/main i386 Packages
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/restricted i386 Packages
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/universe i386 Packages
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/multiverse i386 Packages
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/main Translation-en_IN
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/main Translation-en
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/multiverse Translation-en_IN
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/multiverse Translation-en
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/restricted Translation-en_IN
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/restricted Translation-en
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/universe Translation-en_IN
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise/universe Translation-en
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/main Translation-en_IN
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/main Translation-en
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/multiverse Translation-en_IN
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/multiverse Translation-en
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/restricted Translation-en_IN
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/restricted Translation-en
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/universe Translation-en_IN
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-updates/universe Translation-en
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/main Translation-en_IN
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/main Translation-en
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/multiverse Translation-en_IN
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/multiverse Translation-en
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/restricted Translation-en_IN
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/restricted Translation-en
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/universe Translation-en_IN
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Err http://in.archive.ubuntu.com precise-backports/universe Translation-en
  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
Hit http://extras.ubuntu.com precise Release.gpg
Hit http://extras.ubuntu.com precise Release
Hit http://extras.ubuntu.com precise/main Sources
Hit http://extras.ubuntu.com precise/main i386 Packages
Ign http://extras.ubuntu.com precise/main TranslationIndex
Ign http://extras.ubuntu.com precise/main Translation-en_IN
Ign http://extras.ubuntu.com precise/main Translation-en
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-updates/Release.gpg  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/Release.gpg  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/Release.gpg  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/main/source/Sources  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/restricted/source/Sources  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/universe/source/Sources  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/multiverse/source/Sources  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/main/binary-i386/Packages  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/restricted/binary-i386/Packages  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/universe/binary-i386/Packages  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/multiverse/binary-i386/Packages  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise/main/source/Sources  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-updates/multiverse/source/Sources  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-updates/main/binary-i386/Packages  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-updates/restricted/binary-i386/Packages  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-updates/universe/binary-i386/Packages  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-updates/multiverse/binary-i386/Packages  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/main/source/Sources  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/restricted/source/Sources  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/source/Sources  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/multiverse/source/Sources  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/main/binary-i386/Packages  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/restricted/binary-i386/Packages  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/binary-i386/Packages  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/multiverse/binary-i386/Packages  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/main/i18n/Translation-en_IN  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/main/i18n/Translation-en  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/multiverse/i18n/Translation-en_IN  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/multiverse/i18n/Translation-en  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/restricted/i18n/Translation-en_IN  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/restricted/i18n/Translation-en  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/universe/i18n/Translation-en_IN  Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/multiverse/i18n/Translation-en_IN  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/multiverse/i18n/Translation-en  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/restricted/i18n/Translation-en_IN  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/restricted/i18n/Translation-en  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/i18n/Translation-en_IN  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/i18n/Translation-en  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)

E: Some index files failed to download. They have been ignored, or old ones used instead.

My new "/etc/host" file:

127.0.0.1       localhost  
127.0.1.1       user1-ThinkCentre-M71e  
91.189.92.152   extras.ubuntu.com  
91.189.92.201   in.archive.ubuntu.com  
91.189.91.24    security.ubuntu.com  

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

Solution 1:

It may be a well-known bug in apt-get that does not use the system's DNS to resolve domains. To fix this you may need to add the following line to /etc/hosts (you can edit this file with sudo nano /etc/hosts or sudo gedit /etc/hosts):

 extras.ubuntu.com       91.189.92.152