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I recently installed the gnome-shell package to try out gnome desktop, didn't like it so much so I removed it and returned to unity. I'm trying to fix a few things that seem to have been messed up by gnome:

pressing Super + W crashes unity

I ran unity from a terminal window to get the output from the crash, this is the error message:

compiz (core) - Info: Starting plugin: scale
WARN  2015-08-20 16:48:39 unityo (appinfo2) <unknown>:0 g_settings_set_value: value for key 'visual-bell-type' in schema 'org.gnome.desktop.wm.preferences' is outside of valid range
ERROR 2015-08-20 16:48:39 unity.glib.dbus.server GLibDBusServer.cpp:524 DBus name lost 'org.gnome.Shell'
ERROR 2015-08-20 16:48:39 unity.glib.dbus.server GLibDBusServer.cpp:524 DBus name lost 'com.canonical.Unity'
Segmentation fault (core dumped)

another weird thing is that some applications now seem to be using a different version of gtk or something, nautilus now has only an x button and its on the other side, also the system monitor looks like that now.

some applications like the system settings have stayed the same. whats going on?

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You could, from a TTY, try reinstalling the ubuntu-desktop packages.

sudo apt-get update
sudo apt-get install --reinstall ubuntu-desktop
sudo apt-get install --reinstall unity

This will try to do a fresh install of the Unity environment over whatever is already there, which should fix any issues you are having.

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