Fresh install on Debian Buster using directions on wiki. Everything loads fine and I log into panel go to download Any FTB profile and it downloads fine but seems to hang at ~98%. Try to set a server using profile and the jar file selection is empty. ls -l in the profile directory show that the zip file downloaded but apparently its failing to extract the zip file
If the failure appears to be localized to just that the zipfile isn’t being extracted, you can also try logging in as the same user (the user you’re logging into the webui with) and unzip those files.
The webui only cares that the file exists, now how it gets there. If the zip file is manually extracted, it should appear in the dropdown.