FATAL ERROR : Unable to find composer files Please run composer.phar update

Trying to install latest version on a Ubuntu 18.04 server. Following the guide on your webpage

I get this error when I try to access it the first time

Composer is installed Composer version 1.10.8 2020-06-24 21:23:30

What can I have done wrong?

Regards

ANders Yuran

Hi,
I’ve faced the same error on CentOS 7

Thanks,
Arif