I'm trying to upgrade Ubuntu to the latest version, and I get this Error:

Not enough free disk space



The upgrade has aborted. The upgrade needs a total of 430 M free space on disk '/boot'. Please free at least an additional 37.8 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.

From gparted I read that my /boot partition is 732 MB, with 425 free. I would have gladly allocated more space to /boot to avoid this issue, but given where I'm at now, here's what I did:

• I ran sudo apt autoremove --this made no difference.


• I'm trying to add compression, but the instructions just say set COMPRESS=xz .... Presumably, that means changing the following line in /etc/initramfs-tools/initramfs.conf from this:

COMPRESS=lz4

to this:

COMPRESS=gz

... but then what? Should I save that file and then reboot? Should I log out and log back in again? Should I reinitialize something somewhere with some kind of command? More clarification here would be really helpful. What does it mean to "set" the COMPRESS value and what do I need to do after editing the above file for the changes to take effect?