A workaround is to start it with
python3 -m pympress file.pdf It seems there is a conflict between python3.7 (used by default by pympress) and python3.8 (used by most other programs).
A workaround is to start it with
python3 -m pympress file.pdf It seems there is a conflict between python3.7 (used by default by pympress) and python3.8 (used by most other programs).