Setting up PostgreSQL 13.2&&Python VENV verified by another PyQT5 module on Debian Bullseye

Expecting Debian Bullseye release to happen pretty shortly (by the end of September 2021) PostgreSQL 13.2 setup has been verified on Debian Bullseye/sid as Oracle’s Virtual Box 6.1.22 Guest running in EFI mode along with ongoing hackery of PyQT5 code mentioned in my recent post at Lxer.com