Bug#953369: RuntimeWarning: line buffering (buffering=1) isn't supported in binary mode, the default buffer size will be used

[積丹尼 Dan Jacobson]

Package: python3-apt
Version: 1.9.9

Setting up python3-apt (1.9.9) ...
/usr/lib/python3.8/subprocess.py:838: RuntimeWarning: line buffering 
(buffering=1) isn't supported in binary mode, the default buffer size will be 
used
  self.stdin = io.open(p2cwrite, 'wb', bufsize)