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can't launch gedit after using sudo -i

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linux-howto

http://forums.fedoraforum.org – I have been 'cleaning up' a base system I use for cloning in VirtualBox. Don't recall removing anything 'important' :dis: but must have because now when I issue 'sudo -i' then the password, it gets to root ok, but now if I run an app like gedit, it complains with the messages Quote: No protocol specified Cannot open display: Run 'gedit --help' to see a full list of available command line options. Setting aside all the parms that could be supplied, what might be the cause of this change? TIA (HowTos)