Installation errors when installing qt6.0.0 RC from online installer

Probably this is duplicate of https://bugreports.qt.io/browse/QTBUG-88833

tested on: Ubuntu 18.04.4 LTS

During installation from online installer installation errors keep on showing up (ignore option does not solve anything since then installation is missing e.g examples.

See attached screenshots

Error during installation process (qt.qt6.600.gcc_64):
The output of
/home/anna/Qt/6.0.0/gcc_64/bin/qmake -query
is not parseable. Please file a bugreport with this dialog https://bugreports.qt.io.
output: ""