I have a Jetson nano 2gb and I am in the ubuntu 18.04 terminal and trying to display my live camera feed and other applications, but opening a display fails. For example if I do a simple command such as: xclock
the following error message is shown: Invalid MIT-MAGIC-COOKIE-1 keyError: Can’t open display: :0
Hi,
You may try display 1:
$ DISPLAY=:1 xrandr
If you can see HDMI out it should be wrong index.
Tip: There are logs in “/var/log/”. Among those will be these:
ls -ltr /var/log/Xorg.*.log
Note that this reverse lists them based on timestamp, so the very last one (bottom) is the most recently touched log. If you have an X server using a DISPLAY context of “:0”, then this will use log “Xorg.0.log”; if the context is “:1”, then the log will be “Xorg.1.log”. Any time you are using a terminal within X you can find this with “echo $DISPLAY”. If you are outside of a graphics setting, e.g., logged in via regular console, ssh, or serial console, then you can “export DISPLAY=:0” or “export DISPLAY=:1”, so on.
There are extensions for remote systems, but those will fail unless you have security set up to allow it.
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