Make sure APT doesn’t install Documentation files

Create a file /etc/dpkg/dpkg.cfg.d/01_nodoc which specifies the desired filters. Example:

path-exclude /usr/share/doc/*

# we need to keep copyright files for legal reasons
path-include /usr/share/doc/*/copyright

path-exclude /usr/share/man/*
path-exclude /usr/share/groff/*
path-exclude /usr/share/info/*

# lintian stuff is small, but really unnecessary
path-exclude /usr/share/lintian/*
path-exclude /usr/share/linda/*

Then you can manually remove any documentation already installed:

find /usr/share/doc -depth -type f ! -name copyright|xargs rm || true
find /usr/share/doc -empty|xargs rmdir || true
rm -rf /usr/share/groff/* /usr/share/info/*
rm -rf /usr/share/lintian/* /usr/share/linda/* /var/cache/man/*
rm -rf /usr/share/man/*