apport-gtk doesn't show the window for entering password

[Przemek K.]

Apport-gtk fails to collect data as normal user when root/sudo password is not cached.
When I run apport-collect <bugnumber> for the first time after I logged in, apport hangs on collecting data and waits without end.
When I press ctrl-C, a gksudo dialog shows asking me for my password, but when I enter it, nothing happens.
When I run apport again, the situation repeats.
When I run ps -fe |grep apport, it shows the following process:
azrael 13673 1 0 22:38 ? 00:00:00 /usr/bin/gksu --message <span weight="bold" size="larger">Proszę wprowadzić hasło, aby uzyskać dostęp do raportów o problemach w systemie</span> /usr/share/apport/apport-gtk

When I press ctrl-C and run apport using sudo in the command line, I can finally collect the data for the bug, but sometimes it fails too.
---
ApportVersion: 1.92-0ubuntu1
Architecture: amd64
DistroRelease: Ubuntu 12.04
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64+mac (20120214)
Package: apport 1.92-0ubuntu1
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 3.2.0-16.25-generic 3.2.6
Tags: precise
Uname: Linux 3.2.0-16-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Przemek K. (azrael)]

apport information

[Przemek K. (azrael)]

apport information

[Przemek K. (azrael)]

apport information

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Marcus Tomlinson (marcustomlinson)]

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

[Launchpad Janitor (janitor)]

[Expired for apport (Ubuntu) because there has been no activity for 60 days.]