software-center uses first installed version of ubuntu for partner repository after upgrade

[Chris Mayo]

After upgrading from raring to saucy using do-release-upgrade and then enabling partner repository in software-center GUI, /etc/apt/sources.list has:

deb http://archive.canonical.com/ubuntu raring partner

Manually editing sources.list changing to saucy fixes this.

$ apt-cache policy software-center
software-center:
  Installed: 13.10-0ubuntu1
  Candidate: 13.10-0ubuntu1
  Version table:
 *** 13.10-0ubuntu1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages
        100 /var/lib/dpkg/status

Also seen on a computer that had been upgraded oneiric -> precise -> quantal -> raring -> saucy, sources.list still had oneiric.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[BjA (bjabja)]

I updated from 12.04 to 14.04. After installation, I wanted to use the partner repository and noticed, it was still pointing to natty
in /etc/sources.list/ (this was the first installed release on the computer, as there is also the entry to the deb cdrom: .. pointing to natty in the first line).

When un/checking the Partner distribution channel, in sources.list the entry gets commented/uncommented but always pointing to natty.

I had to manually change sources.list, now it points to trusty and gets commented/uncommented as trustry when clicking/unclicking in software center.

This bug is possbly a duplicate of the follwing older bug:

https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/366771