[Bug 1748581] Re: ubuntu-release-upgrader will need to know how to switch snaps between Ubuntu release channels during an upgrade

[Launchpad Bug Tracker]

This bug was fixed in the package ubuntu-release-upgrader - 1:18.10.9

---------------
ubuntu-release-upgrader (1:18.10.9) cosmic; urgency=medium

  * data/release-upgrades: set Prompt to normal not lts
  * DistUpgradeQuirks.py: if ubuntu-desktop or snapd isn't in the package
    cache don't try and run the quirk for installing or upgrading snaps.
    (LP: #1787668)
  * DistUpgradeQuirks.py: Only refresh installed snaps to the ubuntu-18.10
    channel if they are tracking the ubuntu-18.04 channel. (LP: #1748581)

 -- Brian Murray <brian at ubuntu.com>  Tue, 28 Aug 2018 13:09:55 -0700

** Changed in: ubuntu-release-upgrader (Ubuntu Cosmic)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1748581

Title:
  ubuntu-release-upgrader will need to know how to switch snaps between
  Ubuntu release channels during an upgrade

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Cosmic:
  Fix Released

Bug description:
  As part of the plan for including snaps in Ubuntu images by default
  (https://wiki.ubuntu.com/UbuntuSeededSnaps), we intend for the snap
  installs to be pinned to (possibly empty) per-Ubuntu-release channels
  in the Snap Store.

  This means that as part of a dist upgrade, ubuntu-release-upgrader
  will need to switch the channels of any relevant installed snaps from
  the channel for one release, to the channel for the next release, with
  snap refresh.

  (In many cases both channels will be empty and this will involve
  downloading no new snaps, just changing the pin on the client.)

  Since 18.04 is the first release with snaps by default, this doesn't
  need to be implemented in 18.04; but will need to be supported by the
  release upgrader in 18.10 at latest.

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