On Mon 05 Apr 2004 11:07, Jaap Haitsma wrote: > > I can start x application if I login as myself and then do su -m, but if I > do a su - it says it cannot open the display. Any idea how I have to set > it up to get it working. My Debian box here doesn't have X, but does $ xhost + localhost as the logged-in user solve this problem? Of course you may need to set the display for the root user as well: $ export DISPLAY=:0.0. /Ciaran.