Moving /boot partition
For a while I had a problem with my boot partition being too small. It was fine for one kernel image but not for two. So whenever kernel was updated it was failing because of lack of space. Five years ago 500MB was enough but not nowadays.
Today I decided to finally fix that.
First, I did created new LVM volume for /boot:
sudo lvcreate -L 1G -n boot root-vg