[MapProxy] MapProxy on Ubuntu 20.04

[Stefan Peuser]

I have not expressed myself clearly.
 
 The installation of MapProxy 1.12 was successful. But I cannot install all other packages. 
 apt-get install libproj12 —> E: Paket libproj12 kann nicht gefunden werden (not found) apt-get install python-shapely —> E: Paket python-stapels kann nicht gefunden werden (not found) 
 Starting mapproxy-utilitaristischste serve-develop /path/xyz.yaml leads to an error: ImportError: cannot import name ‘escape‘ from ‘cgi‘ (/usr/lib/python3.8/cgi.py) 
 The call of localhost:8080 after mapproxy-util serve-multiapp-develop /path/ is successful. All files are listed. But selecting a file from the list leads to an error: ImportError: cannot import name ‘escape‘ from ‘cgi‘ (/usr/lib/python3.8/cgi.py) 
 Note: Everything works fine on Ubuntu 18.
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