[ale] frontend: Dialog ?

[ale at pcartwright.com (Paul Cartwright)]

I was trying to install virtualbox, and I got this error message.
e# dpkg -i virtualbox*.deb
(Reading database ... 118122 files and directories currently installed.)
Unpacking virtualbox (from virtualbox_1.5.0-24069-1_Debian_etch_i386.deb) ...
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

frontend: cannot connect to X server :0.0
debconf: unable to initialize frontend: Kde
debconf: (DISPLAY problem?)
debconf: falling back to frontend: Dialog
Setting up virtualbox (1.5.0-24069-1_Debian_etch) ...
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

frontend: cannot connect to X server :0.0
debconf: unable to initialize frontend: Kde
debconf: (DISPLAY problem?)
debconf: falling back to frontend: Dialog
---------------------------------------------------------------
what is Dialog ?
I just installed this control panel app called debian-srv-cp . when I run it 
from root I get this:
e# debian-srv-cp Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

gbx: cannot connect to X server :0.0
---------------------------------
I take it this means root can run an X-windows app, but how do you fix it?

-- 
Paul Cartwright
Registered Linux user # 367800
Registered Ubuntu User #12459