EL 7 :
sudo package-cleanup --oldkernels --count=2
EL 8, EL 9 :
sudo dnf -y remove --oldinstallonly --setopt installonly_limit=2 kernel
Debian 12 and up :
sudo apt autoremove --purge
sudo dpkg -S /lib/modules/*
sudo rm -rd /lib/modules/dpkg -S /lib/modules/* 2>&1 | grep -v "no path found matching pattern" | awk '{ print $NF}' | xargs -I % echo %