up vote 6 down vote favorite

After updating to 15.10 it's impossible to run graphical apps from terminal:

xxx@xxx:~$ gksudo wireshark
Invalid MIT-MAGIC-COOKIE-1 key
(gksudo:5532): Gtk-WARNING **: cannot open display: :0
xxx@xxx:~$ sudo -H wireshark
[sudo] password for xxx: 
Invalid MIT-MAGIC-COOKIE-1 key
** (wireshark:5535): WARNING **: Could not open X display
Invalid MIT-MAGIC-COOKIE-1 keyFailed to connect to Mir: Failed to connect to server socket: No such file or directory
Unable to init server: Could not connect: Connection refused

(wireshark:5535): Gtk-WARNING **: cannot open display: :0
xxx@xxx:~$ wireshark
Invalid MIT-MAGIC-COOKIE-1 key
** (wireshark:5569): WARNING **: Could not open X display
Invalid MIT-MAGIC-COOKIE-1 keyFailed to connect to Mir: Failed to connect to server socket: No such file or directory
Unable to init server: Could not connect: Connection refused

(wireshark:5569): Gtk-WARNING **: cannot open display: :0
xxx@xxx:~$ gedit
Invalid MIT-MAGIC-COOKIE-1 key
** (gedit:5570): WARNING **: Could not open X display
Invalid MIT-MAGIC-COOKIE-1 keyFailed to connect to Mir: Failed to connect to server socket: No such file or directory
Unable to init server: Could not connect: Connection refused

(gedit:5570): Gtk-WARNING **: cannot open display: :0
xxx@xxx:~$ sudo gedit
Invalid MIT-MAGIC-COOKIE-1 key
** (gedit:5574): WARNING **: Could not open X display
Invalid MIT-MAGIC-COOKIE-1 keyFailed to connect to Mir: Failed to connect to server socket: No such file or directory
Unable to init server: Could not connect: Connection refused

(gedit:5574): Gtk-WARNING **: cannot open display: :0

My little research pointed to gksudo using but it ain't working either. I've also tried some stuff with xauth. What is the problem? Thanks.

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1  
Try removing .Xauthority - sudo rm -f ~/.Xauthority and then restarting. – Bharadwaj Raju May 6 '16 at 14:00
    
Nah, same thing. – sssemil May 6 '16 at 14:13
up vote 4 down vote

As a regular user, run the command xhost +. After that, try running your graphical application again.

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up vote 3 down vote accepted

Odd but export DISPLAY=:1 helped. Cheers.

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1  
Are you running multiple X displays or something? Default should be :0 – Bharadwaj Raju May 6 '16 at 14:17
2  
exactly the same issue (on 16.04 in my case); unfortunately this doesn't work. – adam.smith May 7 '16 at 11:45
    
Nope, only one. ":0" was always default but something changed after update. – sssemil May 7 '16 at 17:01
1  
In my case, setting DISPLAY to :0 solved it (while :1 did not) – mbello Jan 27 '17 at 12:54

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