Seafile-controller - cannot execute binary file


I’ve tried to installed seafile server on Ubuntu 18.04.5 with i686 arch 64-bit.
Seafile package 8.0.4 installed correctly(all DBs installed) starts correctly. shows the following error:

>>>sudo seafile-server-8.0.4/ start

Starting seafile server, please wait ...
seafile-server-8.0.4/ line 114: /home/user/seafile-server-8.0.4/seafile/bin/seafile-controller: 
cannot execute binary file: Exec format error

Failed to start seafile server

How to fix this issue?

I686 is 32 bit, isn’t it? Afaik 32-bit builds were dropped a few years ago. Maybe building Seafile yourself would work