> I opened a Terminal window and switched successfully
> to root with
> 
> su -
> 
> Then I typed in:
> 
> /usr/bin/firefox
> 
> Instead of starting the browser the terminal shows
> the output
> 
> "No display specified"
> 
> Whats wrong?
> 
> Why can I not start firefox?

That's because of the "-" in your command line. This results in logging in as a 
new user with the same environment variables as when you log in via, say, 
terminal mode. If you omit the "-" the subshell inherits the actual ones, 
especially the DISPLAY variable which is necessary for GUI programs.
In your case, try "su root" instead.


Regards

Thorsten
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