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ZFS Unable to System Snapshot, bpool is Full?

I first encountered the problem after a routine update / upgrade of the
system. Well there was a kernel upgrade and I have not checked how many
old kernels are still left for backups in /boot. Apparently, there was
a few and the partition is 85% full. Every software update included a
warning because of the restriction in disk space. Also, zfs could not
create snapshots. It is also full. This is not very clear to me.
Snapshots were suppose to be diff copies so why would it take up a
large space. Most of the snapshots are less than 2MB. Or 0MB.

Another problem that popped up is the constant freezing of Rhythmbox. I
don't know if the config files are corrupted. The CPU cycles from one
to the next. Peaks for 5-6 seconds then on to the next CPU. This forced
me to download Clementine and Audacious. But both applications do not
find the zfs pool or don't show the zfs structure. Why not? My final
solution is to reinstall Rhythmbox via snaps. I re-scanned the music
library and I have access to my library again. No more freezing too.

# dpkg --list | grep linux-image : to list your linux kernels

$ uname -r : to get current kernel-release

I don't want to uninstall my current version and also I want to leave a
backup kernel version.

# dpkg --purge linux-image-xxx : to remove the kernel

$ df -h : to check the disk space

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