How to edit/recover 'sources.list' file
Note:
By default you can find a backup of this file inside /etc/apt dir called
sources.list.save
So you can use it to recover your lost one.
sudo cp /etc/apt/sources.list.save /etc/apt/sources.list
Else, if you don't have this file,you can visit this link:http://repogen.simplylinux.ch/ Enter your information and you'll get your customized sources.list file
For the default set of repositories, you need to enable these repositories.
- All of the Ubuntu Branches repositories.
- Security - Important Security Updates.
- Security Sources Repository
- Updates - Recommended Updates
- Updates Sources Repository
Default sources.list file on 14.04:
# deb http://be.archive.ubuntu.com:80/ubuntu/ trusty main restricted
# deb http://be.archive.ubuntu.com:80/ubuntu/ trusty-updates main restricted
# deb http://security.ubuntu.com/ubuntu trusty-security main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://be.archive.ubuntu.com:80/ubuntu/ trusty main restricted
deb-src http://be.archive.ubuntu.com:80/ubuntu/ trusty main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://be.archive.ubuntu.com:80/ubuntu/ trusty-updates main restricted
deb-src http://be.archive.ubuntu.com:80/ubuntu/ trusty-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://be.archive.ubuntu.com:80/ubuntu/ trusty universe
deb-src http://be.archive.ubuntu.com:80/ubuntu/ trusty universe
deb http://be.archive.ubuntu.com:80/ubuntu/ trusty-updates universe
deb-src http://be.archive.ubuntu.com:80/ubuntu/ trusty-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://be.archive.ubuntu.com:80/ubuntu/ trusty multiverse
deb-src http://be.archive.ubuntu.com:80/ubuntu/ trusty multiverse
deb http://be.archive.ubuntu.com:80/ubuntu/ trusty-updates multiverse
deb-src http://be.archive.ubuntu.com:80/ubuntu/ trusty-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://be.archive.ubuntu.com:80/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://be.archive.ubuntu.com:80/ubuntu/ trusty-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu trusty-security main restricted
deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted
deb http://security.ubuntu.com/ubuntu trusty-security universe
deb-src http://security.ubuntu.com/ubuntu trusty-security universe
deb http://security.ubuntu.com/ubuntu trusty-security multiverse
deb-src http://security.ubuntu.com/ubuntu trusty-security multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu trusty partner
# deb-src http://archive.canonical.com/ubuntu trusty partner
## Uncomment the following two lines to add software from Ubuntu's
## 'extras' repository.
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
# deb http://extras.ubuntu.com/ubuntu trusty main
# deb-src http://extras.ubuntu.com/ubuntu trusty main
The location of the file is: /etc/apt/source.list
You can edit it by issuing sudo vi /etc/apt/source.list or sudo nano /etc/apt/source.list (nano might be easier for you).
If you want to add those repositories mentioned, you should add these lines to the bottom of the file:
# Tor Project Repositories
deb http://deb.torproject.org/torproject.org trusty main
deb-src http://deb.torproject.org/torproject.org trusty main