I can't (and don't want to) use a RT kernel because ZFS is not supported.
When I try to remove linux-image-rt-amd64, it seems that there is a dependency for openmediavault-wireguard and wireguard packages :
# uname -a
Linux ovm 6.12.30+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.30-1~bpo12+1 (2025-06-14) x86_64 GNU/Linux
# dpkg -l | grep linux-image-6.12.30
ii linux-image-6.12.30+bpo-amd64 6.12.30-1~bpo12+1 amd64 Linux 6.12 for 64-bit PCs (signed)
ii linux-image-6.12.30+bpo-rt-amd64 6.12.30-1~bpo12+1 amd64 Linux 6.12 for 64-bit PCs (signed), PREEMPT_RT
# apt remove linux-image-rt-amd64
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following packages will be REMOVED:
linux-image-rt-amd64 openmediavault-wireguard wireguard
0 upgraded, 0 newly installed, 3 to remove and 0 not upgraded.
Is it expected ?
Thanks,
Nikos