UBUNTU STUDIO 21.4
apt list --installed 'linux-*'
apt-mark showauto 'linux-*'
apt-mark showmanual 'linux-*'
sudo apt-mark auto '^linux-headers-.*'
sudo apt-mark auto '^linux-image-.*'
sudo apt-mark auto '^linux-modules-.*'
sudo apt --purge autoremove
ll /boot/