SOLVED : Closing the window works. however this is a known issue and wonder there arent any fixes :\
The thing is that whenever i try to change any user settings, network connections or download updates install packages or stuff like that, i need to authenticate the user by punching in the password..
i do type the password in the "authenticate" window and click authenticate, but nothing happens! and an error dialog comes up!
this is giving me a hard time configuring my new ubuntu installation..
p.s i am new to ubuntu!
i tried it in october 2010 and switched to opensuse due to support for mobile modems.
now i switched back to ubuntu and this is a real bad experience..
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