[Bug 1841516] Re: dpkg installation fails due to file conflict between python-cinderclient and python3-cinderclient

[Corey Bryant]

shubjero in #ubuntu-server reports a conflict between python-
cinderclient and python3-cinderclient on bionic-train:

root at lab-controller:~# apt-cache policy python3-cinderclient
python3-cinderclient:
  Installed: 1:4.1.0-0ubuntu1~cloud0
  Candidate: 1:5.0.0-0ubuntu2~cloud0
  Version table:
     1:5.0.0-0ubuntu2~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu bionic-updates/train/main amd64 Packages
 *** 1:4.1.0-0ubuntu1~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu bionic-proposed/stein/main amd64 Packages
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu bionic-updates/stein/main amd64 Packages
        100 /var/lib/dpkg/status
     1:3.5.0-0ubuntu1 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
root at lab-controller:~# apt-get install python3-cinderclient
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
  python3-cinderclient
1 upgraded, 0 newly installed, 0 to remove and 138 not upgraded.
25 not fully installed or removed.
Need to get 0 B/136 kB of archives.
After this operation, 216 kB disk space will be freed.
(Reading database ... 187602 files and directories currently installed.)
Preparing to unpack .../python3-cinderclient_1%3a5.0.0-0ubuntu2~cloud0_all.deb ...
Unpacking python3-cinderclient (1:5.0.0-0ubuntu2~cloud0) over (1:4.1.0-0ubuntu1~cloud0) ...
dpkg: error processing archive /var/cache/apt/archives/python3-cinderclient_1%3a5.0.0-0ubuntu2~cloud0_all.deb (--unpack):
 trying to overwrite '/usr/share/bash-completion/completions/cinder.bash_completion', which is also in package python-cinderclient 1:4.1.0-0ubuntu1~cloud0
Errors were encountered while processing:
 /var/cache/apt/archives/python3-cinderclient_1%3a5.0.0-0ubuntu2~cloud0_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

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https://bugs.launchpad.net/bugs/1841516

Title:
  dpkg installation fails due to file conflict between python-
  cinderclient and python3-cinderclient

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive train series:
  Triaged
Status in Ubuntu Cloud Archive ussuri series:
  Triaged
Status in python-cinderclient package in Ubuntu:
  Invalid
Status in python-cinderclient source package in Focal:
  Triaged

Bug description:
  Upgrading python3-cinderclient from 1:4.1.0-0ubuntu1 to
  2:4.2.1-0ubuntu2 fails on Eoan due to a conflicting file between the
  two packages.

  It seems there is no equivalent 4.2 upgrade for python-cinderclient so
  anyone who previously had both versions installed now meet the
  conflict.

  lathiat at optane ~$ sudo apt-get dist-upgrade --auto-remove --purge
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Calculating upgrade... Done
  The following packages have been kept back:
    lldb
  The following packages will be upgraded:
    python3-cinderclient
  1 to upgrade, 0 to newly install, 0 to remove and 1 not to upgrade.
  Need to get 0 B/139 kB of archives.
  After this operation, 5,120 B of additional disk space will be used.
  Do you want to continue? [Y/n] 
  (Reading database ... 381723 files and directories currently installed.)
  Preparing to unpack .../python3-cinderclient_1%3a4.2.1-0ubuntu2_all.deb ...
  Unpacking python3-cinderclient (1:4.2.1-0ubuntu2) over (1:4.1.0-0ubuntu1) ...
  dpkg: error processing archive /var/cache/apt/archives/python3-cinderclient_1%3a4.2.1-0ubuntu2_all.deb (--unpack):
   trying to overwrite '/usr/share/bash-completion/completions/cinder.bash_completion', which is also in package python-cinderclient 1:4.1.0-0ubuntu1
  Errors were encountered while processing:
   /var/cache/apt/archives/python3-cinderclient_1%3a4.2.1-0ubuntu2_all.deb
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  lathiat at optane ~$

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