There was no problem with the installation, but the system will randomly freeze and take no further input leaving no other option but to force shutdown externally. It tends to happen while running graphics intensive programs. I installed nvidia-driver and bumblebee-nvidia, yet after that the system was unable to output the GUI and I had to reinstall the whole OS since removing those two packages via the command line did not help. I have a GTX 750.
Linux parrot 5.1.0-parrot1-3t-amd64 #1 SMP Parrot 5.1.3-1parrot1.3t (2019-05-20) x86_64 GNU/Linux
I found similar threads about freezes upon shutdown/reboot or launching LibreOffice. Laptops with integrated graphics and a seperate GPU may be affected too, but mine is a desktop with one card.