https://www.gns3.com/community/featured/cant-start-vpcs
"OK my solution - download new vpcs from https://github.com/GNS3/vpcs/archive/refs/tags/v0.8.2.tar.gz and install. Then set cap permission for ubridge
sudo setcap cap_net_admin,cap_net_raw=eip /usr/bin/ubridge"
I can confirm that it works