After I install screenlets and add some items on me desktop, Ubuntu reports crashes time to time. Today I notice the error message is:
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Google “GError: icon ‘gtk-close’ not present in the theme” and find the solution from here:
For me, the bug’s root cause is that the screenlet(s) are looking for “gtk-close.png” which wasn’t installed in 12.04 by default. I added “gnome-icon-theme-full” from the repositories, which includes gtk-close.png, and the issue has not come back.
So the fix is: