when I open the software updater this message opens up: not enough free space The upgrade needs a total of 136 M free space on disk '/boot'. Please free at least an additional 45.2 M of disk space on '/boot'. You can remove old kernels using 'sudo apt autoremove', and you could also set COMPRESS=xz in /etc/initramfs-tools/initramfs.conf to reduce the size of your initramfs.
sudo autoremove doesn't work.
what should I do?
thanks and regards
In response to the comments:
Here it is ls /boot:
config-4.15.0-144-generic memtest86+.elf config-5.4.0-74-generic memtest86+_multiboot.bin grub System.map-4.15.0-144-generic initrd.img System.map-5.4.0-74-generic initrd.img-4.15.0-144-generic vmlinuz initrd.img-5.4.0-74-generic vmlinuz-4.15.0-144-generic initrd.img.old vmlinuz-5.4.0-74-generic lost+found vmlinuz.old memtest86+.bin
and here df /h:
Filesystem Size Used Avail Use% Mounted on udev 1.9G 0 1.9G 0% /dev tmpfs 388M 1.8M 386M 1% /run /dev/mapper/ubuntu--vg-root 913G 9.6G 857G 2% / tmpfs 1.9G 0 1.9G 0% /dev/shm tmpfs 5.0M 4.0K 5.0M 1% /run/lock tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup /dev/sda1 236M 137M 87M 62% /boot tmpfs 388M 32K 388M 1% /run/user/1000
