The pre-zpool space reclaim kept the two newest kernels (running + one
fallback). Kernels are large (~200 MiB each), so drop to keeping ONLY
the running kernel — with two guards:
- If a NEWER kernel than the running one is already installed (upgrade
pending a reboot), keep that too: purging it would make the next
reboot boot an OLDER kernel than the one currently running.
- The linux-image-<arch> meta package (no version, holds no payload) is
excluded from the purge; deleting it would silently stop apt from
pulling future kernel upgrades.
Verified on this host: running 6.12.101 kept, 6.12.95 purged, meta
package untouched.
Co-authored-by: CommandCodeBot <noreply@commandcode.ai>
