To be fair to Debian, that's how it's supposed to work. You untar into /opt, self contained, while your apt install puts things in the Filesystem Hierarchy Sta

To be fair to Debian, that's how it's supposed to work. You untar into /opt, self contained, while your apt install puts things in the Filesystem Hierarchy Standard, which means config goes into /etc. You'll find most distros follow some FHS standard, although there's some differences in interpretation.