

You might have too many old kernels installed. This would potentially fill up the /boot partition. One way to check this is:
df -h
Look for the line indicating space left for /boot.
You can then get a list of the installed kernels with:
dpkg --get-selections | grep -v deinstall | grep linux-image
If you need to remove old ones, use uname -a to identify the running kernel (should be the latest version if you’ve rebooted after the last kernel update) then remove all of the older kernel packages with:
sudo apt remove -y linux-image-amd64-xxxx
More generally speaking, I think that sudo apt autoremove should leave you with only the latest 2 kernel packages by default.





Trying to keep a Lab out of pretty much any body of water is just not gonna happen.