Comment 36 for bug 1687623

Update-manager is fixed now and as Andy wrote, a change in the process should prevent this from ever happening again. Unfortunately that does not help anybody who is already having the problem (at least not if that means no network connection). And without network it is hard to find any documents about this on the net.

If network is not affected the remaining kernel packages will get offered by update-manager (the same way as the apt-get variant). If it is affected one needs to boot into the previous kernel and I personally wished the grub boot menu were not hidden away by default (pressing left-shift at the exactly right time is something I never manage to do). As long as it is possible to login into the broken system can be enabled by modifying /etc/default/grub (commenting out the two lines with GRUB_HIDDEN_... and uncommenting, if needed, the GRUB_TIMEOUT line, setting it to 5 (seconds)), then "sudo update-grub" and reboot.