Try clicking on System/Administration/Software sources.
Check Ubuntu Software tab make sure the top for choices are checked then click the dowload from bar select other and run the test to find the best download server.
Next click other software and make sure you have.
http://archive.canonical.com/ubuntu karmic partner checked.
After you close that go to System/Administration/Users and groups.
Click your user account and click the key icon at the bottom to make changes.
then go to properties make sure your in your user name and not root.
Click the User Privileges and make sure Administer the system is checked use video devices and audio devices as well.
Why these are not default I have no idea.
Good luck
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