Ubuntu: left-click on launcher icon does not start the application



Question:

After upgrading from Ubuntu 10.04 (lucid lynx) to Ubuntu 12.04 (precise pangolin) almost everything works fine, except launcher.

For most icons, left-click on the icon in the launcher does not trigger start of the application in question. Only starting the Dash and opening the Trash works. No other application can be started by left-click on its icon in the launcher.

My hardware: Toshiba Satego X200 laptop with nVidia GeForce 8700M GT.

Prior to upgrading I tested Ubuntu 12.04 from a bootable DVD. Prior to upgrading I de-installed almost all non-Canonical-supported packages, and afterwards re-installed via Ubuntu Software Center and Synaptic whatever I need.

As an attempt to solve the problem I tried the terminal command unity --reset-icons, however, this did not help.

During execution of unity --reset-icons a lot of messages were displayed in the terminal, which I quote below in part (omissions marked by [...]). I hope this gives a clue as to what is wrong.

$ unity --reset-icons    Checking if settings need to be migrated ...no  Checking if internal files need to be migrated ...no  Backend     : gconf  Integration : true  Profile     : unity  Adding plugins  Initializing core options...done  [...]  Initializing scale options...done  compiz (expo) - Warn: failed to bind image to texture  Initializing expo options...done  Initializing ezoom options...done  (compiz:2599): GConf-CRITICAL **: gconf_client_add_dir: assertion `gconf_valid_key (dirname, NULL)' failed  WARN  2013-02-03 16:05:13 unity.favorites FavoriteStoreGSettings.cpp:139 Unable to load GDesktopAppInfo for 'ubiquity-gtkui.desktop'  Initializing unityshell options...done  WARN  2013-02-03 16:05:14 unity.libindicator <unknown>:0 Desktop file '/usr/share/applications/libreoffice-writer.desktop' is using a deprecated format for its actions that will be dropped soon.  WARN  2013-02-03 16:05:14 unity.libindicator <unknown>:0 Desktop file '/usr/share/applications/libreoffice-calc.desktop' is using a deprecated format for its actions that will be dropped soon.  WARN  2013-02-03 16:05:14 unity.libindicator <unknown>:0 Desktop file '/usr/share/applications/libreoffice-impress.desktop' is using a deprecated format for its actions that will be dropped soon.  WARN  2013-02-03 16:05:14 unity.launcher Launcher.cpp:3088 Object registration failed. Won't get dynamic launcher addition.  ERROR 2013-02-03 16:05:14 unity.glib-gobject <unknown>:0 g_object_unref: assertion `G_IS_OBJECT (object)' failed  Setting Update "main_menu_key"  Setting Update "run_key"  


Solution:1

Worked for the original poster of this fix: (fixed Unity system bar and launcher):

Reinstall all already installed packages in Synaptic related to searches libgl and glx.

May be needed first:

sudo apt-get purge fglrx fglrx-amdcccle    # or another fglrxs  

But FGLRX drivers doesn't feel alright on my computer anymore, so goodbye FGLRX :( . No idea why.

Credit goes to this post


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