Can't install modules in Drupal 8 Ubuntu - Should I change owner?
go to the folder where you installed Drupal 8. Ex:

cd /var/www/drupal


In you case, it looks like it's:

cd /var/www/html/benia


then

sudo chown www-data -R modules


Now try installing again.

To prevent other conflict, I would www-data all of your Drupal

cd /var/www/html/

sudo chown www-data -R benia