Most common errors that happens when installing PlexusLAB are related to a faulty PHP installation.
Your PHP service might be running an old and unsupported version of PHP: PlexusLAB needs at least PHP Version 7.4 to run.
Assuming you already installed Ubuntu, check your PHP version is equal or greater then 7.4, but not 8 or higher (currently unsupported). On your terminal use the command
You must get a message similar to the following. If you are running an older version of PHP you may need to re-run the installation script, or, in the worst case, please Google how to upgrade it.
PHP 7.4.3 (cli) (built: Oct 6 2020 15:47:56) ( NTS ) Copyright (c) The PHP Group Zend Engine v3.4.0, Copyright (c) Zend Technologies with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies
If PHP is loaded correctly, but you still can't access the website at
http://localhost/plexus, the error might be related to the Apache Service.
Check your Apache System status with the following command
sudo systemctl status apache2
It should have active running status.
apache2.service - The Apache HTTP Server Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor prese> Active: active (running) since ....
# Find your remote machine's IP
If you don't know your remote machine's IP Address, you can run this command in a remote shell, and then navigate to
# Find PlexusLAB password and ID
By default, PlexusLAB password and a machine ID are randomly generated.
To retrieve them, run this command on your machine.
sudo php /var/www/html/plexus/system/php_scripts/getpass.php
The output will contain both fields with the following structure