Comment 53 for bug 1457369

You can boot to the previous kernel as a workaround.

As root, edit: /etc/default/grub

You should have this line in there:

  GRUB_DEFAULT=0

Comment that out, and replace it with:

  GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux 3.19.0-16-generic"

The part before the '>' is what you see at the top-level of the grub boot menu, and the part after is what you'd select to get the previous kernel. You may need to check your own boot menu to see if those strings match.

Then run: sudo update-grub

And then reboot. It should automatically take you to the old (working) kernel.

Don't forget to set GRUB_DEFAULT back to zero after the next kernel comes out.