PROBLEM Access problems

[reinerknudsen]

Hello all, I just recently discovered GS and I absolutely love it. I installed it locally with MAMP and it works perfectly. But when I try to get it on a webserver it simply doesn't work. I tried bot the normal and the Community edition.

WebServer on Raspberry (Ubuntu)
Installation works. I can start the first installation screen and don't get any errors. I have Apache2 (2.4.55) and php 8.1.12 running. I checked the required modules and they are all running. When I click "Continue with setup" I get the screen to enter the title, user and email. When I click "Install now", I immediately get a 500 error.

   

The errorlog gives me multiple errors in regards to access issues:
"[13-Sep-2023 11:51:12 Europe/Berlin] PHP Warning:  chmod(): Operation not permitted in /var/www/html/admin/install.php on line 44" (x 14)
As these are warning, I ignore them for the moment. They also come when I set all files an directories to 777, by the way.
The more significant part is this:
---

[13-Sep-2023 12:10:08 Europe/Berlin] PHP Warning:  fopen(/var/www/html/.htaccess): Failed to open stream: Permission denied in /var/www/html/admin/setup.php on line 125
[13-Sep-2023 12:10:08 Europe/Berlin] PHP Fatal error:  Uncaught TypeError: fwrite(): Argument #1 ($stream) must be of type resource, bool given in /var/www/html/admin/s>
Stack trace:
#0 /var/www/html/admin/setup.php(126): fwrite()
#1 {main}
  thrown in /var/www/html/admin/setup.php on line 126
---
I have no idea what to make from this.
I copied the temp.htaccess to .htaccess which disabled the site. Then I followed the advise to comment out pieces bit by bit. When I commented out the "rewrite" section I was back in the install dialog, but still couldn't proceed any further with the installation, running in exactly the same issues as above.

Please help me out here. I googled a lot but didn't get something which helped me.
What information else do you need. Please let me know.

Thanks for your help.
Reiner