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I got the following error message from Software Updater:
The upgrade needs a total of 74,6 M free space on disk '/boot'. Please free at least an additional 68,3 M of disk space on '/boot'. Empty your trash and remove temporary packages of former installations using 'sudo apt-get clean'.
How can I get more disc space? I have
df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/xubuntu--vg-root 454G 13G 418G 3% / none 4,0K 0 4,0K 0% /sys/fs/cgroup udev 1,9G 4,0K 1,9G 1% /dev tmpfs 384M 1,3M 383M 1% /run none 5,0M 0 5,0M 0% /run/lock none 1,9G 24M 1,9G 2% /run/shm none 100M 36K 100M 1% /run/user /dev/sda2 237M 219M 6,1M 98% /boot /dev/sda1 511M 3,4M 508M 1% /boot/efi