Comment 3 for bug 1841516

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

root@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@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)