[Bug 2058938] [NEW] deb822 sources not updated if old sources.list still in use

[Nick Rosbrook]

Public bug reported:

The most common case where this would be seen is for users that added
ppas with apt-add-repository on mantic. Assuming /etc/apt/sources.list
is still being used for the default sources, then this gives a system
with mixed .list and .sources, and ubuntu-release-upgrader will only
update the .list sources.

To reproduce on a mantic system:

$ apt-add-repository -y ppa:<user>/<name>
$ do-release-upgrade -d

Observe that the PPA sources added will still be enabled and still point
to mantic.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: High
     Assignee: Nick Rosbrook (enr0n)
         Status: Triaged


** Tags: foundations-todo

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

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => High

** Changed in: ubuntu-release-upgrader (Ubuntu)
     Assignee: (unassigned) => Nick Rosbrook (enr0n)

** Tags added: foundations-todo

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https://bugs.launchpad.net/bugs/2058938

Title:
  deb822 sources not updated if old sources.list still in use

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged

Bug description:
  The most common case where this would be seen is for users that added
  ppas with apt-add-repository on mantic. Assuming /etc/apt/sources.list
  is still being used for the default sources, then this gives a system
  with mixed .list and .sources, and ubuntu-release-upgrader will only
  update the .list sources.

  To reproduce on a mantic system:

  $ apt-add-repository -y ppa:<user>/<name>
  $ do-release-upgrade -d

  Observe that the PPA sources added will still be enabled and still
  point to mantic.

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