I report the same problem, using Kubuntu. Linked repository failed with:
jenik@jenik-HP-ProBook-6470b:~/sw/Uranium-master$ python run_mypy.py
File "run_mypy.py", line 8
def where(exe_name: str, search_path: str = os.getenv("PATH")) -> str:
^
SyntaxError: invalid syntax
AppImage works perfectly it appears.