Same page as before for the intallation

Hello,

I installed a php7.2/apache2/mysql (5.7.28) on Ubuntu 18.04 and "adminer.php" for management. I created a user and a database, everything works very well under adminer.php, the log and pw are well recognized etc. and the database is there accessible with the log and pw.
OK also for projeqtor ( with chown -R www-data: /var/ww/ww/html/projeqtor/files and chmod -R 755 /var/ww/html/projeqtor/files)

On the other hand, there is still the error:
impossible to write \'.../tool/parametersLocation.php\' file, cannot write to such a file : check access rights

Then on the second page I don't understand what still needs to be done: we go back to the same page as before (Configuration
This screen will help you configure ProjeQtOr at first run.)

Thank you for your help.
G. Uzel

Thank you for your answer, but in fact the parametersLocation.php file does not exist in projeqtor/tool
I just looked at it.
chmod chown I did it twice.

All right, I'll see if there's a way to force it when I have time.
Thank you for your availability.

Be very careful: the use of -R commands creates many problems in Debian/Ubuntu systems and I had some very big problems. Do not try to install projectqtor if rights issues arise.