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my install procedere was like this:

Dependencies
sudo apt-get install qt5-default
sudo apt-get install libqt5x11extras5-dev
sudo apt-get install jackd
sudo apt-get install libjack-dev
sudo apt-get install libasound2-dev
sudo apt-get install libsndfile1-dev
sudo apt-get install liblrdf0-dev
sudo apt-get install qttools5-dev-tools

Source Code: https://sourceforge.net/projects/qtra...
Extract source code in downloads folder

Compile and Install
cd qtractor
./configure
make
sudo make install

Enable Realtime Mode for Jack
sudo nano /etc/security/limits.conf
add line: @audio - rtprio 99
sudo usermod -a -G audio username
logout and login

Launch Program
qtractor

i will now reinstall ubuntu 18.04 and perform compile again, hope it works, because i like the concept of qtractor very much.