Comment 14 for bug 1892448

Still broken of focal:

```
$ apt-get install ceph-base ceph-deploy
...
Unpacking ceph-deploy (2.0.1-0ubuntu1) ...
dpkg: error processing archive /tmp/apt-dpkg-install-ZP1daC/27-ceph-deploy_2.0.1-0ubuntu1_all.deb (--unpack):
 trying to overwrite '/usr/share/man/man8/ceph-deploy.8.gz', which is also in package ceph-base 15.2.11-0ubuntu0.20.04.2
dmesg: read kernel buffer failed: Operation not permitted
                                                         Selecting previously unselected package ceph-mds.
Preparing to unpack .../28-ceph-mds_15.2.11-0ubuntu0.20.04.2_amd64.deb ...
Unpacking ceph-mds (15.2.11-0ubuntu0.20.04.2) ...
Selecting previously unselected package ibverbs-providers:amd64.
Preparing to unpack .../29-ibverbs-providers_28.0-1ubuntu1_amd64.deb ...
Unpacking ibverbs-providers:amd64 (28.0-1ubuntu1) ...
Errors were encountered while processing:
 /tmp/apt-dpkg-install-ZP1daC/27-ceph-deploy_2.0.1-0ubuntu1_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

```

Seen on https://askubuntu.com/q/1345687/66509 .