How to solve "Sorry, wp-config.php file is not writable" when trying to install wordpress in ubuntu?

Question

Access rights

This is the first time I'm facing this problem.
The fact is that for the www folder, I set myself serii as a user for folders and files.
This is what all the folders look like.

итого 20
drwxr-xr-x  5 serii serii 4096 авг 30 11:01 ./
drwxr-xr-x 13 root  root  4096 авг 30 09:34 ../
drwxr-xr-x  2 serii serii 4096 авг 30 09:34 html/
drwxr-xr-x  5 serii serii 4096 авг 30 11:39 portfolio.loc/
drwxrwxr-x  3 serii serii 4096 авг 30 11:35 test.loc/

Answer 1

What's stopping him from editing wp-config.php?

File write permissions must be 777.