Just installed Kubuntu 12.10 AMD64 desktop

get same problem trying to run bleacbit as root
gksudo   -k bleachbit did not work - did get error message: 
Error copying '/tmp/kde-jay/xauth-1000-_0' to '/tmp/libgksu-db2kSu': No such 
file or directory

but,  in /tmp is:
drwx------  2 jay  jay  4096 Mar 12 18:45 libgksu-db2kSu
in there is 
-rw-------  1 jay  jay     0 Mar 12 18:45 .Xauthority

note: zero-length.
and /tmp/kde-jay is empty.

nothing interestin in /var/log/Xorg.0.log
no errors in /var/log/auth.log

weird message in syslog
Mar 12 18:53:45 pc-14-large dbus[780]: [system] Activating service 
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Mar 12 18:53:45 pc-14-large org.kde.powerdevil.backlighthelper: 
QDBusConnection: system D-Bus connection created before QCoreApplication. 
Application may misbehave.
Mar 12 18:53:45 pc-14-large dbus[780]: [system] Successfully activated service 
'org.kde.powerdevil.backlighthelper'
Mar 12 18:55:00 pc-14-large dbus[780]: [system] Activating service 
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Mar 12 18:55:00 pc-14-large org.kde.powerdevil.backlighthelper: 
QDBusConnection: system D-Bus connection created before QCoreApplication. 
Application may misbehave.
Mar 12 18:55:00 pc-14-large dbus[780]: [system] Successfully activated service 
'org.kde.powerdevil.backlighthelper'

hope this helps.
Jay

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https://bugs.launchpad.net/bugs/1100219

Title:
  su-to-root -X -c bleachbit: Could not open X display

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