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First of all I deleted the guest session so no guest could log in but now when I start my computer the login screen shows a guest session option also. And then after I login the screen freezes but I can move the cursor. But the screen freezes for forever. I have some important data in my laptop will I lose all the data. Pls help

My system: HP pavillion g6-1200TU with 2 GB Ram, Intel Core i3-2330M with 2.2 ghz having 4 cores, with Intel HD graphics 3000, 500gb HDD

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You just need to turn the Unity plugin back on. The problem is this is a pain in the bottom because you've now got no graphical method to do this. So:

Try to open a terminal with Ctrl+Alt+T.

This may not work but you can try right clicking on the desktop and selecting "Open terminal here." Otherwise, you may need to change to a "hard" terminal by pressing Ctrl+Alt+F1 and log in.

Install compizconfig-settings-manager by running

sudo apt-get install compizconfig-settings-manager

Then run it with this:

DISPLAY=:0 ccsm &

The first part tells the terminal which display you want it to load on (otherwise it won't have a clue).

If you switched to a TTY in step 1, switch back to the graphical server by pressing Ctrl+Alt+F7 (or Ctrl+Alt+F8 sometimes).

There there should be a CompizConfig Settings Manager waiting for you.

Find the Unity plugin. Enable it. You will be asked "Ubuntu Unity Plugin requires the plugin OpenGL. Enable Ubuntu Unity Plugin / Enable OpenGL"

Everything should spring into life but if it doesn't, you might have to restart. You can do that by going back to the terminal and running sudo reboot.

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  • I have installed compizconfig-settings-manager. Do I need to run Display :-0 ccsm & command directly from the terminal? What command should i type to run it. And pls tell the commands which i have to type. I am new to ubuntu. Pls help – Rohit Barua Sep 10 '16 at 9:01
  • I have done it. It doesn't help – Rohit Barua Sep 10 '16 at 9:19
  • Thanks. I have fixed the problem. Actually I installed Java 8 on ubuntu 16.04 last night and did something with the path variable in /etc/environment file, so it was causing the problem. So I changed it back to what it was earlier and rebooted. And the system is running perfect now. Thanks! – Rohit Barua Sep 10 '16 at 20:10
  • Pretty neat. I'm running Ubunto 16.04 LTS in VMWare. But while your solution brings up ccsm, after reboot I still have the same problem. – vy32 Jul 23 '17 at 20:57
  • I have a similar problem with the symptoms, but the terminal shortcut does nothing, and trying to switch to a tty makes the screen freeze completely. I think the noveau drivers are to blame, probably something to do with modeset, but I can't get into a terminal to change it. Can't get into grub either, it just doesn't respond to shift. – user469966 Sep 5 '17 at 21:12
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If the screen grays out a bit and the mouse changed into an X, then there is probably/likely an X authentication problem. I had this happen to me because (after playing around a bit) I ended up with an empty (size 0) /home/carlo/.Xauthority file owned by root. Removing that file fixed the problem (if you kill Xorg it will restart and then let you login as normal).

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