Invalid MIT-MAGIC-COOKIE-1 key (gksudo:2984): Gtk-WARNING **: cannot open display: :0
104717
Can't launch graphical apps from terminal after updating to 15.10
3898
Why is pkexec preferred over gksudo for graphical applications?
17092
Open a window on a remote X display (why "Cannot open display")?
22415
Could not find required OpenGL entry point 'glGetError'
58759
How to fix missing GPG keys?
8295
E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)
92002
Why does an error appear every time I try to open the Ubuntu Software Center?
101206
Cannot access secondary GPU - error: Could not load GPU driver
44530
Remote login with graphical display manager (GDM, LightDM)
148976
xdg-open on debian 9 fails to open browser
124545
How can I install GTK themes on Ubuntu?
28000
"GPG error:The following signatures were invalid: KEYEXPIRED"
112305
Incompatible magic value 1008813135
109370
Password not working in Graphical Applications (gksu)? Works with sudo
158283
Xlib: extension "GLX" missing on display ":0". Asus k53s
57251
Unable to mount: exit code 1
57212
ubuntu 16.04 gives "X Error of failed request: BadValue (integer parameter out of range for operation)" when running OpenGL programs