Comment 3 for bug 203568

I had this too. After update on the 19th mouse doesn't move.
/dev/input/mice didn't exist (although /dev/mouse0 and /dev/mouse1 did). No /dev/input
did
sudo dpkg-reconfigure xserver-xorg and that got the mouse working.
/dev/null /dev/zero /dev/random not read or writable by anyone but root
did
sudo chmod a+rw /dev/null /dev/zero /dev/random

That got me into gnome desktop.
Terminal didn't work.
did
sudo chmod a+rw /dev/pt* /dev/tt*

That got terminal working.
Can't do Alt-f1 to change virtual terminal

On reboot these changes need done again.

No idea if what I've done represents a huge security risk.

Looks like whatever populates the /dev isn't working right. Not sure what that package is?
Anyone?