Comment 20 for bug 1646222

If patch https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1678187/comments/8 is applied, there is no need for one extra sizeof(initramfs) in separate /boot since the new file is created in "${TMPDIR:-/var/tmp}" and the old one is only replaced by it in /boot. But still some other partition may be too full for kernel update. E.g. /usr/src may run out of inodes due to linux-headers-* packages.