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I upgraded from 13.04 to 14.04 with downloaded updates no CD. It looks like I now need the APT line for update repositories for 14.04 LTS. This is what is says when I try to update/reload information about installed software. And I do have a working internet connection.

The information about available software is out-of-date

To install software and updates from newly added or changed sources, you have to reload the information about available software.

You need a working Internet connection to continue.

 W:Failed to fetch cdrom://Ubuntu 13.04 _Raring Ringtail_ - Release i386 (20130424)/dists/raring/main/binary-i386/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs, E:Some index files failed to download. They have been ignored, or old ones used instead.

Screen capture of Software & Updates sub menu Software-Properties-gtk .

Enter the complete APT line of the repository that you want to add as source. The APT line includes the type, location and components of a repository, for example 'deb http://archive.ubuntu.com/ubuntu trusty main'

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possible duplicate of Failed to download repository information due to missing CDROM –  Nattgew Jun 5 at 16:28

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