hello there ,
this is what i did on debian 9
apt-get update & upgrade
apt-get install mysql* & apache2*
apt-get install rt4-*
apt-get install request-tracker4
everything is ok ! now the apache server is working on 80 . and there is NO RT !
the RT_SiteConfig.pm file under /etc/request-tracker4 is empty , it gices me this output after a cat command .