QSqlDatabase: QPSQL driver not loaded - linux ubuntu

[ellorenz]

Hi to all
I built a new ubuntu 18.04 virtual machine,
i have installed
apt-get install postgresql
apt-get install postgresql
apt-get install libpq-dev
apt-get install libpq-dev python-dev
sudo apt-get install libqt5sql5-psql
apt-get install postgresql-client
From repositories was installed the version of postgres
Then i installed qt from online installer and i using 5.15.2 version
QSqlDriver give message QPSQL is present but give me the message Driver not load.
This is installation is on hyper-v virtual machine
another installation on vmware machine tries to load the library with -avx2 postfix and gives me the same error

There is anyone can help me?

[JonB]

@ellorenz
Always the same answer for this question: you need to set environment variable export QT_DEBUG_PLUGINS=1 and run your application, it will send diagnostic output to stdout/stderr, you usually need to look at the end of it to see what's failing.

[ellorenz]

@JonB Found the problem sorry

If you declare

QSqlDatabase database
database.addDatabase("QPSQL");

instead of
QSqlDatabase database = QSqlDatabase::addDatabase("QPSQL");

It lost drivers pointer at open function