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Please don't mark it as duplicated. I've tried a lot but can't make it working.

I've installed LAMP using tasksel. Everything is fine but having file permission error (While installing WordPress I get this error "Sorry, but I can’t write the wp-config.php file." )

I can create the file manually but I don't want to do this. I wasn't to make it working correctly.

What I did to set up permission after installing lamp

cd /var/wwww/ sudo chown -R username:www-data /var/www/html/ sudo chmod 775 /var/www/html/ sudo chmod g+s /var/www/html/

Later I tried some solutions like sudo chown -R [USER NAME]:[USER NAME] /var/www which I found on askubuntu.

I don't know much about permission issue trying solution blindly.

Can you please help me on this to make it working? :)

Output of ls -l /var/www
Output of total 4 drwxrwsr-x 3 h3mdsa h3mdsa 4096 Jun 12 16:40 html
(Thanks @Jos for comment)

Thanks in advanced,
Md Al Amin

Hey it works like a magic. Can you please tell me why sudo chown -R username:www-data /var/www/html/ didn't work? I used it on other machine 2 month ago. It worked but didn't work this time. Anyway thanks for help. – alaminio Jun 12, 2015 at 11:57 Hard to tell why that did work on the other machine - it shouldn't have worked. Apache2 runs with user name www-data and executes PHP statements as that user. Allow me to rewrite my comment as an answer. – Jos Jun 12, 2015 at 12:13 If Jos his answer is correct why is this NOT a duplicate? Hmm? @alamin72103 for instance: your method works but does need a change to groups: askubuntu.com/questions/353847/apache-permissions or askubuntu.com/questions/378351/… and many more ;) – Rinzwind Jun 12, 2015 at 12:55

You were close: the directory /var/www/ should be owned by www-data (as a user) and www-data as a group. So the proper command, if things get messed up, is:

sudo chown -R www-data:www-data /var/www

You need to change the group of the web files to your Linux user name or at least add user 'root' to the group "www-data"

usermod -a -G www-data root
There is also a three-step technique by which you can solve this:
Those three are in the link below.
This post can solve the full problem.
https://www.spookycodes.com/2019/11/09/fix-linux-lamp-server-permission-issues-ultimate-fix-2020/