После обновления системы не запускается Gnome

При запуске Gnome получаю следующее сообщение

Please contact your system administrator to resolve the following problem:
Could not resolve the address "xml:readonly:/etc/gconf/gconf.xml.system" in the configuration file "/etc/gconf/2/path": Couldn't resolve address for configuration source: Can't read or write to the XML root directory in the address "xml:readonly:/etc/gconf/gconf.xml.system"