i'm experiencing this problem too. disabling the virt-manager indicator-applet fixes the problem.
this is the output from 'virt-manager --debug': 2011-01-14 09:46:27,126 (connection:1236): Connection doesn't seem to support interface APIs. Skipping all interface polling. 2011-01-14 09:46:27,195 (connection:214): Using HAL for netdev enumeration 2011-01-14 09:46:27,196 (connection:251): Using libvirt API for mediadev enumeration (virt-manager:3918): LIBDBUSMENU-GLIB-CRITICAL **: dbusmenu_menuitem_property_set_value: assertion `DBUSMENU_IS_MENUITEM(mi)' failed (virt-manager:3918): LIBDBUSMENU-GLIB-CRITICAL **: dbusmenu_menuitem_property_set_value: assertion `DBUSMENU_IS_MENUITEM(mi)' failed 2011-01-14 09:46:27,212 (manager:803): VM ebox started 2011-01-14 09:46:31,655 (engine:634): window counter incremented to 2 2011-01-14 09:46:34,939 (engine:812): Starting vm 'lubuntu-mav-alpha'. (virt-manager:3918): LIBDBUSMENU-GLIB-CRITICAL **: dbusmenu_menuitem_property_set_value: assertion `DBUSMENU_IS_MENUITEM(mi)' failed Errore di segmentazione ** Changed in: virt-manager (Ubuntu) Status: Invalid => New ** Changed in: virt-manager (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/672590 Title: virt-manager crashes when using system tray applet -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs