Comment 14 for bug 1678187

Tested in 16.04

Lower free space at /boot to 10MB by the following one-liner:

sudo dd if=/dev/zero of=/boot/tmpfile bs=1MB count=$(($(stat -f --format="%f*%S" /boot)/1000000-10))

Then remove a linux-image-extra package by apt, e.g.

sudo apt purge linux-image-extra-4.10.0-19-generic

Check status of the package:

dpkg -l linux-image-extra-4.10.0-19-generic

(If you run

sudo apt purge linux-image-4.10.0-19-generic

There is an error, too, but the requested package will be removed. Running 'sudo apt install' thereafter finishes removing the linux-image-extra package.)

Remember to remove the created temporary file:

sudo rm /boot/tmpfile