Immediate failure during install

Your software
My PHP version is : 7.4
My MySQL/MariaDB version is 10.3.35

Updating/Installing Errors
*I am: Installing Mautic 4.3.1
installing via Command Line

These errors are showing in the installer :

The site is currently offline due to encountering an error. If the problem persists, please contact the system administrator.

System administrators, check server logs for errors.

These errors are showing in the Mautic log : empty - mautic/var/logs directory is empty.

My problem is :
I am attempting a normal installation: downloaded zip file from mautic.org, uploaded it to my subdomain, unzipped install package; created DB, and updated php max_execution_time to 240. When I browse to mymautic.mydomain.org, I immediately see that I am redirected to mymautic.mydomain.org/installer, and I am presented with the error message:
The site is currently offline due to encountering an error. If the problem persists, please contact the system administrator.
System administrators, check server logs for errors.

Note that this is occurring before I even reach the environment check page.

Steps I have tried to fix the problem :
I’ve checked permissions, which all seem to be correct - I’ve even updated the permissions to allow all users to access and retried, but I get the same result. I’ve also checked the logs, which appear to be empty.

Hi
If you manually run the cache clear command, what error you are getting?

php bin/console cache:clear

Make sure you run it as a web user otherwise all your assets will be overwritten with the wrong user.
You should get a nice green message.

What do you mean by running it as a web user?

When you login to your ssh as root and give commands as root then you spoil the cache file system by generating files with the wrong owner. Files have to be generated with the user that runs apache or nginx. Often this is user www-data.