changing user with SU, gives "Xlib: connection to ":0.0" refused by server"

[Mario Vukelic]

On Mon, 2007-10-08 at 13:28 +0100, (=?utf-8?q?=60=60-=5F-=C2=B4=C2=B4?=)
-- Fernando wrote:
> Any ideas?

If you insist on using su, then:
sudo aptitude install sux

Otherwise, gksu is superior in every way.