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I cannot use the user the gnome-shell-extensions-user-theme because there is no button on the tweak tool to enable extensions! I've completely uninstalled and reinstalled the gnome-tweak-tool, no difference. Any suggestions? Bruce.

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Having the same issue, didn't notice this post before, here is mine:… let me know if you figure out the problem – sadmicrowave Oct 31 '11 at 16:02

I had the same problem. Seems that the file metadata.json has a wrong shell-version. At least for Ubuntu 11.10. To solve the issue I had to:

  • cd ~/.local/share/gnome-shell/extensions/
  • cd into the desired extension directory.
  • edit the metadata.json file and change
"shell-version": [ "3.3.2" ] 
"shell-version": [ "3.2" ],
  • logout from Gnome-Shell and login again. Now you should see all the estensions in gnome-tweak-tool.
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This is a weird answer.. after a clean installation of Ubuntu 13.04 i realized that neither the works (all the extensions are greyed out) nor the Gnome Tweak tool worked..

I tried following many steps (and reverting them). The simplest was to go back to the Login page and change the desktop manager from the default Ubuntu to Gnome.. That fixed all the issues.

Hope this helps.

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Had the same problem 10 minutes ago :D. This very brief command saved the day:

sudo apt-get remove fglrx*

It purges all installations and references for the proprietary graphics driver and once you restart gnome-shell, 3D acceleration is re-enabled and gnome-shell plus other applications requiring 3D acceleration run properly.

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