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How do I fix this? I will attempt to upload a screenshot of the problem. Notice there is an error like triangle near the shell themes and nothing is select-able. Also there are no shell extensions under the shell extensions tab. I have come across many postings on how to fix this but none worked for me. I currently have 12.04 LTS. I have a custom Phenom quad core machine with Radeon HD 5770 graphics if that helps.


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If you are using gnome-classic session, You can't enable shell theme, simply because you aren't using gnome-shell.

Login to Gnome session, which uses Gnome-Shell. Install the user-theme extension by going to this page. Close the gnome-tweak-tool and re-open it. You should now change the gnome-shell theme

You should also install gnome-shell themes to be able to select a custom theme than the default one.

See this question: How do I get and install more themes, icons, and pointers?

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When I log out from my main user name, the only other option is "Guest". How do I create the Gnome login so that I can be logged in under the Gnome session? – Chris Sep 30 '12 at 16:12
OK I think we are getting somewhere now. When I go there and search it gnome sessions does not appear. I cannot find it in the software center either. – Chris Sep 30 '12 at 19:37
Where did you go? Please first Logout. Then in Login screen where you usually provide password, there will be a small circle beside your name. Click it and select from popup menu "Gnome". – Anwar Shah Oct 1 '12 at 0:25
OK that part I have now. Now in the Gnome Tweak Tool it will show me shell extensions, but none are select-able, and I still have the triangle beside of "shell theme". – Chris Oct 1 '12 at 7:43
Did you login to "Gnome" session? If yes, first install the extension by clicking the link in the answer. then close gnome-tweak-tool and start it again. You still need to install other gnome-shell theme to be able to change theme. I'll updating the answer to give you that information – Anwar Shah Oct 1 '12 at 7:49

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