It’s the same error if I try VANILLA or GAPPS
[SOLUTION] It works after you enter a password using “lxpolkit”.
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Seems like you have a permissions issue. I just tested it on Fedora workstation gnome, run it from regular menu, then it asked me for password. You, you have a permission denied isssue, so you need to figure out how to run it as root.
Yep, that seems to be it. lxpolkit worked for me.