Hi, It seems this bug was already fixed by #954640, and you should use latest humanfriendly/8.1-2.
python3-humanfriendly: humanfriendly.terminal module missing from package https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=954640 http://qa-logs.debian.net/2020/03/21/cyvcf2_0.11.6-1_unstable.log indicates that it uses humanfriendly/8.1-1 (old version). This package lacks humanfiriendly.terminal module. FYI: Here is the d/changelog about 8.1-2 Changes: humanfriendly (8.1-2) unstable; urgency=medium . * Team upload. . [Christian Pommranz] . * Install humanfriendly.terminal module (Closes: #954640)