Hi
dxvk_versions = [v["tag_name"] for v in json.load(dxvk_version_file)]
KeyError: 'tag_name'
I had the same error and solved it just now. I guess it is incorrect json file in the 'cache' which was not updated during upgrade, so what I had to do is:
sudo apt remove lutris
rm -rf .local/share/lutris/
sudo apt install lutris
Before I thought that purge would help, but it didn't:
sudo apt purge lutris
Miro