What you want to achieve is out of scope of apache2-suexec-custom. The filename in /etc/apache2/suexec is the name of the run user of apache2, i.e. whatever is specified as 'User' in /etc/apache2/apache2.conf. Or put it differently, that's the user suexec changes from, while SuexecUserGroup specifies the user suexec changes to.
This is described in the suexec man page, but I guess the description could be more clear. ** Changed in: apache2 (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in Ubuntu. https://bugs.launchpad.net/bugs/890219 Title: suexec-custom is not working correctly: only reading the www-data user config file. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/890219/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs