I just tried to
my 3.6.2 image and it failed updating
Processing triggers for initramfs-tools (0.130) ... ln: failed to create hard link '/boot/initrd.img-4.14.62+.dpkg-bak' => '/boot/initrd.img-4.14.62+': Operation not permitted update-initramfs: Generating /boot/initrd.img-4.14.62+ gzip: stdout: No space left on device E: mkinitramfs failure cpio 141 gzip 1 update-initramfs: failed for /boot/initrd.img-4.14.62+ with 1.
/boot is only ~43MB
no room for two initrd images of ~11MB left
I had to
to fix /boot/config.txt as well. Otherwise there was no pi2/pi3 section left after the kernel update.
I noticed that 3.6.2 initially had no initrd files in /boot, but
still exists from package
This in combination with the small /boot seems to fail badly.