I have solved the problem. Somehow my /etc/shadow file got in group
"root" instead of "shadow" which caused /sbin/unix_chkpwd to not be able
to access it. I have changed group to "shadow" and now it works OK. But
I do not remember playing with groups on shadow, some tool must have
done it.
BTW. It seems kcheckpasswd is not using kcheckpasswd PAM file.
** Changed in: Ubuntu
Status: Needs Info => Rejected
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Cannot unlock screen in Kubuntu
https://launchpad.net/bugs/45411
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