[Bug 2039590] Re: after upgrade to mantic, duplicate entries in /etc/apt/sources.list

[Steve Langasek]

Never mind, this code triggers if the upgrader finds no candidates for
the ubuntu-minimal or ubuntu-standard packages.  Because I had a
previously failed upgrade and re-ran it, both packages were up-to-date
from mantic when running the upgrader and therefore u-r-u misdetected my
system as not having valid sources.list and added these lines in.

Not /entirely/ self-inflected (I needed a way to re-run the upgrader to
apply quirks after a failing package during the upgrade), but not worth
trying to change the current behavior.

** Changed in: ubuntu-release-upgrader (Ubuntu Mantic)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/2039590

Title:
  after upgrade to mantic, duplicate entries in /etc/apt/sources.list

Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid
Status in ubuntu-release-upgrader source package in Mantic:
  Invalid

Bug description:
  Running 'apt showsrc' on mantic I saw surprising output:

  [...]
  W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:42 and /etc/apt/sources.list:58
  W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:42 and /etc/apt/sources.list:58
  W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:42 and /etc/apt/sources.list:58
  [...]

  And line 58 is:

  deb http://security.ubuntu.com/ubuntu mantic-security main restricted
  # auto generated by ubuntu-release-upgrader

  this is a duplicate of the lines I already had in sources.list before
  upgrade.

  diffing /etc/apt/sources.list against
  /etc/apt/sources.list.distUpgrade, aside from the change in release
  name, I see the following added lines:

  +deb http://archive.ubuntu.com/ubuntu mantic main restricted # auto generated by ubuntu-release-upgrader
  +deb http://archive.ubuntu.com/ubuntu mantic-updates main restricted # auto generated by ubuntu-release-upgrader
  +deb http://security.ubuntu.com/ubuntu mantic-security main restricted # auto generated by ubuntu-release-upgrader

  It looks like the upgrader quirk to handle the case where
  security.ubuntu.com is missing from sources.list might be misfiring?

  Also I see no justification for adding archive.ubuntu.com to the
  sources.list, which clearly already had a mirror configured prior to
  the update.  We should not be adding archive.ubuntu.com to
  sources.list on upgrade.

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