[Bug 1784165] Re: Upgrader leaves proposed pocket enabled

[Adam Conrad]

FWIW, pins can use wildcards.  You could have used *-proposed instead of
artful-proposed (and maybe the wiki docs should recommend that) and you
wouldn't have run into this issue.

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Title:
  Upgrader leaves proposed pocket enabled

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

Bug description:
  I just updated from Artful to Bionic using the usual GUI. Before
  upgrade, I had artful-proposed in sources.list, with a
  /etc/apt/preferences.d/proposed-updates pin as follows:

  Package: *
  Pin: release a=artful-proposed
  Pin-Priority: 400

  This pin is recommended in
  https://wiki.ubuntu.com/Testing/EnableProposed.

  I forgot I had this here. I've ended up with Bionic installed, but
  fully upgraded up to proposed. The preferences file wasn't touched,
  and since it is release-specific, it now has no effect.

  Could you perhaps detect if the proposed pocket appears in
  sources.list or sources.list.d and disable it like you do PPAs before
  upgrade?

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