I had the same buggy experience with Parabola a couple of months ago, they're
working on a new installer called "calamares graphical installer", have some
Patience.
https://wiki.parabola.nu/Get_Parabola
"There is a beta preview release featuring the calamares graphical installer
which aims to be more user-friendly than previous editions of Parabola. This
is a LiveCD/USB running the LXDE desktop environment; but note that the
installer included with this edition will install a system that runs the Mate
desktop environment, which will look somewhat differently than the live
environment."
