Problem located.
$ cat /var/log/auth.log
new unix_chkpwd[15399]: check pass; user unknown
new gnome-screensaver-dialog: (pam_unix) authentication failure; logname=
uid=1000 euid=1000 tty=:0.0 ruser= rhost= user=dahen
libpam-modules: 0.79-4ubuntu2
$ cat /etc/var/pam.d/gnome-screensaver
@include common-auth
$ cat /etc/var/pam.d/common-auth
auth required pam_unix.so nullok_secure
$ ls -l /sbin/unix_chkpwd
-rwxr-sr-x 1 root shadow 18128 2006-12-20 18:59 /sbin/unix_chkpwd
$ ls -l /etc/shadow
-rw-r----- 1 root root 1038 2007-04-02 08:18 /etc/shadow
unix_chkpwd is setGID but /etc/shadow does not belong to the shadow
group.
The solution is therefore to change group on /etc/shadow or to setUID
/sbin/unix_chkpwd
--
Password not accepted when attempting to logging back in after locking the
screen
https://bugs.launchpad.net/bugs/97569
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