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Errors when using package

Error: Could not open the space navigator device. Did you remember to run spacenavd (as root)?

Example:

Solution:

Error: failed to grab the spacenav device: Device or resource busy

Example:

And spacenav_node publishes /spacenav/{joy,twist} with value of 0.

Solution:

What I tried is:

1) connect spacenav ( blue led is on : this means X server found the mouse)
2) run spacenavd
3) unplug and plug spacenav until it did not outputs "fialed to grab..." goto
4) start spacenav node

2019-11-30 13:17