[Bug 1784165] Re: Upgrader leaves proposed pocket enabled

[Robie Basak]

> Could you explain why you think -proposed should be disabled...

That's only a suggested resolution that'd I'd be happy with.

The core issue I'm reporting is that I previously had artful-proposed
enabled but pinned low priority such that I didn't have most packages in
artful-proposed installed - only the ones I had cherry-picked to test.
After I upgraded to Bionic, I ended up with everything in bionic-
proposed installed. For me, that's a regression because I went from
(stable + a few selected untested) to (everything* untested).

The best resolution for me would be for ubuntu-release-upgrader to
detect and update my pin to Bionic. But I don't expect it to be able to
do that, so I think always disabling proposed would be sufficient.

There's a old thread on ubuntu-release@ that discussed having -proposed
enabled after release. The most relevant post I can find on this is
https://lists.ubuntu.com/archives/ubuntu-
release/2016-October/003950.html. In general, at least at the moment,
it's considered a bad idea. Note that I had Artful _pinned low_ in
proposed before upgrade. Since that pin stopped acting after upgrade to
Bionic, I ended up in the situation this thread considers bad.

I think disabling proposed would be better than this. I didn't know
about bug 1199157 before, but I guess what I'm saying is that we should
_also_ disable proposed on stable upgrades (therefore always disable it
regardless of target).

There's also talk of always pinning -proposed for users, which would
also resolve this issue: https://lists.ubuntu.com/archives/ubuntu-
release/2016-October/003954.html

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

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https://bugs.launchpad.net/bugs/1784165

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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