Ubuntu: Invalid MIT-MAGIC-COOKIE-1 key (gksudo:2984): Gtk-WARNING **: cannot open display: :0


when i run tuxcut,i see this message i try this command and not run tuxcut

user@server:~$ xhost +localhost  su -  Defaults env_keep=DISPLAY  xhost +localhost &  xhost +SI:localuser:root &  gksudo "lxterminal --command "nano /etc/default/grub""  

how i solve this issue?


Use su without the dash. That will keep the XAUTORITY environment variable intact.

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