(In reply to Jozef Kovac from comment #17) > i star again but i think first is same. > > how can i remove installed kernels(this way) ? just delete all related file > in /boot and /lib/modules ? Yes, remove the corresponding /boot/vmlinuz*, and /lib/modules/$VERSION, /boot/System.map*. Then update grub config via /usr/sbin/grub2-mkconfig -o /boot/grub2/grub.cfg