"Failed To Fetch" when installing KDE [duplicate]

I'm trying to install KDE 5 on my Ubuntu 16.04 system as per the instructions in this tutorial, but I'm getting the below error message when running sudo apt-get install kubuntu-desktop.

Is there something I can do to resolve this?

Need to get 682 kB/326 MB of archives.
After this operation, 1,272 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Err:1 http://ir.archive.ubuntu.com/ubuntu xenial/universe amd64 
            gtk2-engines-oxygen amd64 1.4.6-1ubuntu1
  Temporary failure resolving 'ir.archive.ubuntu.com'
Get:2 http://ir.archive.ubuntu.com/ubuntu xenial/universe amd64 
            libkf5sendlater5 amd64 4:15.12.3-0ubuntu1 [45.2 kB]
Get:3 http://ir.archive.ubuntu.com/ubuntu xenial/universe amd64 
            libthreadweaver4 amd64 4:4.14.16-0ubuntu3 [46.6 kB]
Get:4 http://ir.archive.ubuntu.com/ubuntu xenial/universe amd64 
            libfarstream-0.2-5 amd64 0.2.7-0ubuntu1 [192 kB]
Fetched 284 kB in 1min 9s (4,093 B/s)        
E: Failed to fetch http://ir.archive.ubuntu.com/ubuntu/pool/universe/g/
            gtk2-engines-oxygen/gtk2-engines-oxygen_1.4.6-1ubuntu1_amd64.deb  
            Temporary failure resolving 'ir.archive.ubuntu.com'

E: Unable to fetch some archives, maybe run apt-get update or 
            try with --fix-missing?

You are having temporary difficulty reaching http://ir.archive.ubuntu.com I've found that one good way to resolve this problem is by opening Software And Updates. Choose Download from Other.

SnU

Choose Select best server

SnU2

You'll see this:

SnU3

Click Choose Server to select the recommended server

"Failed To Fetch" when installing KDE [duplicate]

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