Good time of day.
Try to put on UbuntuServer 16 Glpi 9.2.2.
After configuring LAMP and composer on the server page in the browser I see the message:
Run composer install --no-dev" in the glpi tree.
To install composer please refer to https://getcomposer.org/"
Then follow the indication to produce this action at the server, but eventually gets it. I can't understand what he wants from me. Maybe someone faced with similar?