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I tried enabling the cube desktop in compiz and unity vanished. No reboots will bring it back. I tried reinstalling ubuntu desktop and that did nothing. I tried resetting compiz to defaults and enabling the unity plugin and that did nothing either. I've basically tried everything in every answer and they haven't done a thing. So let me know what information I need to give you and I'll type it out here. This happened ten minutes after updating from 12.04-14.04.

I do get an error "plugin opengl not loaded."

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    Is unity running okay under a guest account?
    – Parto
    Apr 25, 2014 at 21:06
  • @Parto yes. I went ahead and made another admin account and transferred my files. Inelegant fix but it's better than reinstalling. Thanks for your comment, it helped a lot. Apr 26, 2014 at 5:50
  • That meant the issue was in your local config files not in the global configs. Inelegant fix but a fix all the same.
    – Parto
    Apr 26, 2014 at 6:28
  • @Parto how does one fix the local config files? Tried resetting everything to no avail. I ask this for future readers, potentially. Apr 26, 2014 at 7:18

4 Answers 4

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  1. Open Virtual Console via CTRL + ALT + F1
  2. Reinstall unity , ubuntu desktop and lightdm using the command line below

    sudo apt-get update && apt-get install --reinstall unity ubuntu-desktop lighdm
    
  3. Check your unity by re-run it.

    unity
    

    read the error line shown on the console If it match the Error message shown blow , Go To Step 4. otherwise (if no Error log displayed) ,re-install your driver and reboot your device .

    Error : plugin "opengl" could not be loaded
    
  4. restore xorg.conf files amd reset plugins

    sudo mv /etc/X11/xorg.conf.XXXXXXXX /usr/share/X11/xorg.conf.d/xorg.conf
    
    export DISPLAY=:0
    
    gsettings reset org.compiz.core:/org/compiz/profiles/unity/plugins/core/ active-plugins
    
  5. reboot your PC

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  • The line from the step 4 with /etc/X11/xorg.conf.XXXXXXXX didn't work for me, but "gsettings reset ..." saved the day!
    – otognan
    Nov 14, 2016 at 18:14
  • There is a type in the first line. Change lighdm to lightdm Nov 28, 2016 at 22:13
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Run ccsm from a terminal. If you can't open a terminal do the following:

Press Ctrl+Alt+F1, log in and then:

DISPLAY=:0 ccsm

After it opens re-enable Unity Plugin (from Desktop category) and OpenGL plugin (from General category).

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    OpenGL is enabled. I tried disabling and re-enabling. Nothing changed. Apr 25, 2014 at 19:21
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Try using

sudo apt-get install --reinstall unity

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Use:

sudo apt-get install dconf-tools
dconf reset -f /org/compiz/

as described on WEB UPD8 post

Seb

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