I have just downloaded seafile-server-8.0.7 and installed it on Lubuntu 20.04.3 LTS, 64-bit.
The setup-seafile.sh did its job nicely, and seafile-controller and seaf-server are running with sensible-looking arguments.
I ran seahub start but saw this barebones error:
Starting seahub at port 8000 ... Error:Seahub failed to start. Please try to run "./seahub.sh start" again
I ran the command again with the same result, and looked in the logfile, but nothing there.
Considering how well done the installation script is, I was surprised there wasn’t any more information in the error message.
What more information could I provide to help you understand what has gone wrong?