This bug also affects pcsx2 (ps2 emulator). And I've used UNE ppa to try
Unity.
Manually installed libgtk2.0-0_2.20.0-0ubuntu4_i386.deb from
http://packages.ubuntu.com/lucid/libgtk2.0-0
Bug seems to be fixed.
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Alacarte CRITICAL **: menu_proxy_module_load: assertion `dbusproxy != NULL'
Hm. Be accurate with my solution. You also have to remove appmenu-gtk
and install vanilla (from lucid repo) versions of:
libgail18_2.20.0-0ubuntu4_i386.deb
libgtk2.0-bin_2.20.0-0ubuntu4_all.deb
libgtk2.0-dev_2.20.0-0ubuntu4_i386.deb
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Alacarte CRITICAL **: menu_proxy_module_load: assertion