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I think I make mistake when I do the configuration of veyon, now I detele the old key file and would like to add a new key file. But veyon can't see the pem key file in desktop.
how to delete all the veyon old setting and reinstall veyon?
Simply remove the /etc/veyon directory as well as the configuration file /etc/xdg/Veyon\ Solutions/Veyon.conf. Afterwards you can start from scratch
/etc/veyon
/etc/xdg/Veyon\ Solutions/Veyon.conf