After installing new kernel update unity is not loading. Just blank screen without Unity panel. I have tried to delete Unity and Compiz config files, and to reinstall Unity, but there is no result. I also tried to boot with older kernel, but there is the same situation with unity. If in terminal (Ctrl+Alt+F1) try to run unity command, then will be message

 WARNING: no DISPLAY variable set, setting it to :0

I also checked if the video driver installed by runing lshw -c video, and the driver was mentioned there. How to solve this problem? Maybe I need to reinstall video driver (but I don't know how to reinstall built-in driver for my Intel HD Graphics 4000), or maybe something wrong with xorg...


Open the console by the following keys:


Then do the following:

Use this to Remove/Uninstall Compiz Unity:

sudo apt-get remove compizconfig-settings-manager
sudo apt-get remove compiz-fusion-plugins-extra
sudo apt-get remove compiz-plugins-extra
sudo apt-get purge compiz*

Then to Re-install Compiz Unity use:

sudo apt-get install unity-2d
sudo apt-get install ubuntu-desktop
sudo apt-get install ubuntu-desktop-2d
sudo apt-get install compizconfig-settings-manager
sudo apt-get install xserver-xgl
sudo apt-get install emerald
sudo apt-get install compiz-fusion-plugins-extra
sudo apt-get install git compiz-plugins-extra
sudo apt-get install compiz-plugins-extra
sudo apt-get install unity
| improve this answer | |
  • Am I need to install unity 2D? – Ilia May 30 '14 at 14:30
  • No, you can just choose what you want. – Korkel May 30 '14 at 14:34
  • It seems that I have to remove ubuntu-desktop, unity, xserver-xlg before installing these packages? – Ilia May 30 '14 at 14:39
  • I suggest you to do. – Korkel May 30 '14 at 14:41
  • No result. Unity still not working. When I was runing sudo apt-get purge compiz*, near the end of output I got (gconftool-2:4185): GConf-WARNING **:Client failed to connect to the D-BUS daemon: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11 – Ilia May 30 '14 at 15:19

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