Fix lack of disk space on louvre:/
The root filesystem on louvre became full last night between 4am and 5am.
Proposed fixes:
- extend the filesystem. Only 20 GB are currently being used while 500 GB remain free on the vg-louvre volume group.
- remove various pve-kernel packages and other Linux versions. Only one of them is obviously being used while at least 25 different ones use space on the root filesystem.
Migrated from T1165 (view on Phabricator)