[Bug 1919261] Re: Upgrading Ceph from 14.2.11-0ubuntu0.19.10.1~cloud4 to 15.2.8-0ubuntu0.20.04.1~cloud0 fails when ceph-mds is installed

[Chris MacNaughton]

I see the same thing as Tyler with the latest package in the Train UCA
as well. In addition, I can confirm that an upgrade from the UCA Train
version of ceph-mds to bionic-ussuri (proposed, verified with:
15.2.16-0ubuntu0.20.04.1~cloud0) or to focal (proposed, verified with:
15.2.16-0ubuntu0.20.04.1) works as expected, and the upgrade progresses
correctly.

** Tags removed: verification-needed verification-needed-focal verification-ussuri-needed
** Tags added: verification-done verification-done-focal verification-ussuri-done

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Title:
  Upgrading Ceph from 14.2.11-0ubuntu0.19.10.1~cloud4 to
  15.2.8-0ubuntu0.20.04.1~cloud0 fails when ceph-mds is installed

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive ussuri series:
  Fix Committed
Status in ceph package in Ubuntu:
  Invalid
Status in ceph source package in Focal:
  Fix Committed

Bug description:
  [Impact]
  Package upgrades will fail due to a move of a file between packages

  [Test Case]
  Install ceph-mds 14.2.11-0ubuntu0.19.10.1~cloud4 (from UCA) on bionic
  do-release-upgrade to focal
  package upgrade will fail.

  [Where problems could occur]
  Version declarations might not be correct; upgrade might still break with the same conflict.

  [Original Bug Report]
  In a host where ceph-mds is installed, upgrading from 14.2.11-0ubuntu0.19.10.1~cloud4 to 15.2.8-0ubuntu0.20.04.1~cloud0 fails with:

  dpkg: error processing archive /tmp/apt-dpkg-install-Zen6uw/9-ceph-common_15.2.8-0ubuntu0.20.04.1~cloud0_amd64.deb (--unpack):
   trying to overwrite '/usr/bin/cephfs-data-scan', which is also in package ceph-mds 14.2.11-0ubuntu0.19.10.1~cloud4
  dpkg-deb: error: paste subprocess was killed by signal (Broken pipe)
  Errors were encountered while processing:
   /tmp/apt-dpkg-install-Zen6uw/9-ceph-common_15.2.8-0ubuntu0.20.04.1~cloud0_amd64.deb
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  The problem happens because /usr/bin/cephfs-data-scan is provided by
  ceph-mds in 14.2.11-0ubuntu0.19.10.1~cloud4:

  # dpkg -S /usr/bin/cephfs-data-scan
  ceph-mds: /usr/bin/cephfs-data-scan

  However in 15.2.8-0ubuntu0.20.04.1~cloud0 it is provided by ceph-
  common:

  # dpkg -S /usr/bin/cephfs-data-scan
  ceph-common: /usr/bin/cephfs-data-scan

  A quick workaround is to temporarily remove ceph-mds before the
  upgrade (dpkg -r ceph-mds) and then perform the upgrade process using
  apt install. It will upgrade all packages and reinstall ceph-mds.

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