In case of Ubuntu, the issue may arise because of missing Unity plugin as well. In that case, a simple unity reinstall may not work. You need to manually enable the unity plugin. To do so,
- Follow step 1 above. Hit ALT + CTRL + F1 to open a tty.
- Install compizconfig-settings-manager
$ sudo apt-get install compizconfig-settings-manager
and, reinstall unity$ sudo apt-get --reinstall install unity
- Tell the tty to open the compiz config settings manager in the GUI by the command,
DISPLAY=:0 ccsm &
- Switch back to GUI from the tty by pressing
ALT + CTRL + F7
There, you will be greeted with CompizConfig Settings Manager - Find the Unity plugin. Enable it. You will be asked “Ubuntu Unity Plugin requires the plugin OpenGL. Enable Ubuntu Unity Plugin / Enable OpenGL”
- Go back to the tty1 by ALT + CTRL + F1 and reboot.
$ sudo reboot
- Done!
I have added a YouTube video to help understand things easily. Do comment down if you stuck anywhere in between. Happy to help 🙂
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