Sorry that installing on Debian/Ubuntu hasn’t been easier. I’m afraid the core team developing PsychoPy is very small and busy!
That said, I just tried to install on a VM running a clean install of Ubuntu 20.04 and this appears to work:
sudo apt-get install psychopy # fetches outdated version from debian
sudo apt-get install python3-pip python3-wxgtk-webview4.0
# update to latest psychopy:
pip3 install -U psychopy
# fix some incompatible lib versions:
pip3 install cffi==1.14.0 psychtoolbox==3.0.16
Those 4 lines should be enough that you can now start PsychoPy and edit experiments!
To get psychtoolbox working for keyboard use you also need the following steps to raise the priority of the experiment process:
sudo groupadd --force psychtoolbox
sudo usermod -a -G psychtoolbox $USER
then do sudo nano /etc/security/limits.d/99-psychopylimits.conf and copy/paste in the following text to that file:
@psychtoolbox - nice -20
@psychtoolbox - rtprio 50
@psychtoolbox - memlock unlimited
Thanks all those (in this and other threads) that contributed to the above lines in one way or another 