Need more information..
What version / Distribution of Linux is this ? I'm going to guess this is some version of Redhat or Fedora ?
Have you verified your sources list is good ?
Have you looked at that referenced directory and what files are in it ?
does the %gconf.xml file exist ?
Are the permissions/ownership correct on the file ?
-rw------- 1 root root 355 2008-11-05 08:35 %gconf.xml
do you have free space on the partition ? df -h
If theres no free space left it won't be able to write any new files..