There is information from auth.log:
Oct 24 17:42:22 mikhail-Latitude-E6520 lightdm: pam_unix(lightdm:auth):
conversation failed
Oct 24 17:42:22 mikhail-Latitude-E6520 lightdm: pam_unix(lightdm:auth): auth
could not identify password for [mikhail]
Oct 24 17:42:24 mikhail-Latitude-E6520 lightdm: pam_succeed_if(lightdm:auth):
requirement "user ingroup nopasswdlogin" not met by user "mikhail"
Oct 24 17:42:25 mikhail-Latitude-E6520 lightdm: pam_unix(lightdm:auth):
conversation failed
** Also affects: lightdm
Importance: Undecided
Status: New
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-screensaver in Ubuntu.
https://bugs.launchpad.net/bugs/880436
Title:
locked screen does not recognise the user password
Status in Light Display Manager:
New
Status in “gnome-screensaver” package in Ubuntu:
New
Bug description:
Ubuntu 11.10 (release 11.10)
version of gnome-screensaver 3.2.0-0ubuntu1
screensaver does not recognise the user password (saying that it is
incorrect; language and keyboard layout are checked and correct). I
can login if switching users but not directly through a screensaver
To manage notifications about this bug go to:
https://bugs.launchpad.net/lightdm/+bug/880436/+subscriptions
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