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I have Ubuntu 12.04 LTS. I need the correct output because I edited it because it wasn't working but it has only made it worse.

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    Easier would be for you to provide yours and we tell you what is wrong (that way you do not need to wait for someone with 12.04 ;) ) – Rinzwind Apr 3 '14 at 20:15
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    It will depend where you are as you will be using a server close to but I live in the UK and mine is here – Warren Hill Apr 3 '14 at 20:18
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    More or less the same with French mirrors: paste.ubuntu.com/7200373 – Sylvain Pineau Apr 3 '14 at 20:21
  • Remember to give details when asking for help, like what you've already tried (or changed in this case). This situation can be avoided by making a backup of files with cp filename.backup before editing them. This way it's easy to revert to the original. – Starbuck Apr 30 '19 at 14:19
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Here is a simple example of a standard /etc/apt/sources.list file for Ubuntu 12.04:

deb http://archive.ubuntu.com/ubuntu precise main universe restricted multiverse
deb http://archive.ubuntu.com/ubuntu precise-updates universe main multiverse restricted
deb http://archive.ubuntu.com/ubuntu precise-backports universe main multiverse restricted
deb http://archive.ubuntu.com/ubuntu precise-security universe main multiverse restricted

The easiest way to edit the sources.list file is from the terminal in nano editor using the following command:

sudo nano /etc/apt/sources.list  

The instructions for using nano are always displayed at the bottom of the page. Use the keyboard combination Ctrl + O and after that press Enter to save the file to its current location. Use the keyboard combination Ctrl + X to exit nano.

Make sure to run this command after changing sources.list to refresh the list of available software.

sudo apt update  

A standard sources.list file for Ubuntu 16.04 looks like this:

deb http://archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse  
deb http://archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu xenial-security main restricted universe multiverse  
deb http://archive.canonical.com/ubuntu xenial partner  

A standard sources.list file for Ubuntu 18.04 looks like this:

deb http://archive.ubuntu.com/ubuntu/ bionic main restricted universe multiverse  
deb http://archive.ubuntu.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu bionic-security main restricted universe multiverse  
deb http://archive.canonical.com/ubuntu bionic partner
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I know it is quite late to answer this question but since (being a newbie), I spent more than 24 hours due to this issue, I found this link quite helpful. It contains all default content for the ubuntu files: https://repogen.simplylinux.ch/

Actually this site takes information from the user about their distro of linux and the names of files they want and then provides the default content of files as output which we can copy and use.

  • Please include essential parts of the page here. – Codito ergo sum Apr 30 '19 at 11:03
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    Actually this site takes information from the user about their distro of linux and the names of files they want and then provides the default content of files as output which we can copy and use. – ARK Apr 30 '19 at 12:45

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