[Bug 1768620] Re: removal_blacklist.cfg updates

[Steve Langasek]

Hello Brian, or anyone else affected,

Accepted ubuntu-release-upgrader into bionic-proposed. The package will
build now and be available at https://launchpad.net/ubuntu/+source
/ubuntu-release-upgrader/1:18.04.18 in a few hours, and then in the
-proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: ubuntu-release-upgrader (Ubuntu Bionic)
       Status: Confirmed => Fix Committed

** Tags added: verification-needed verification-needed-bionic

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https://bugs.launchpad.net/bugs/1768620

Title:
  removal_blacklist.cfg updates

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

Bug description:
  [Impact]
  The release-upgrader tarball includes a file, removal_blacklist.cfg, which lists packages which should never be removed. During the development of Ubuntu 18.04 this list was not updated and some packages which could be removed still exist in that file which could prevent the upgrader from calculating the upgrade. This would cause a bad experience for users as they will be stuck on the previous release of Ubuntu.

  [Test Case]
  To test the unity blacklist issue
  1) Using an up to date Ubuntu 16.04 install restore the apt-clone file in bug 1768561
  2) Ensure /etc/update-manager/release-upgrades has Prompt=lts
  3) Run 'do-release-upgrade -d'
  4) Observe a failure to calculate the upgrade i.e. "ERROR Dist-upgrade failed: 'The package 'unity' is marked for removal but it is in the removal blacklist.'"

  Using the release upgrader tarball from -proposed the release upgrade
  should be successfully calculated.

  Additionally, testing the release upgrade process of a "regular"
  system from 16.04 to 18.04 and 17.10 to 18.04 is a good idea to ensure
  that the release upgrade process works.

  [Regression Potential]
  Syntax errors in removal_blacklist.cfg may cause the release upgrader crash so keep an eye out for those although it is just line removals.

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