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Boruch.

Are you using Wayland? If so, I think this is the same as

https://bugs.launchpad.net/ubuntu/+source/gui-ufw/+bug/1592380

The fix[1] is to run

xhost si:localuser:root

Mark

[1] https://bugs.launchpad.net/ubuntu/+source/gui-ufw/+bug/1592380/comments/6