[Bug 26184] Re: Lock screen doesn't accept password

[teaker1s]

*** This bug is a duplicate of bug 26175 ***

I cured mine by reselecting keyboard both in gnome and 
sudo dpkg-reconfigure xserver-xorg
and renaming iceauthority to backup so a new one is created.

It would appear the bug is caused by keyboard config either in gnome or
xorg

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Lock screen doesn't accept password
https://launchpad.net/bugs/26184