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Minor version missing for Debian >= 10

See original GitHub issue

For Debian >= 10 distro can’t get the minor version.

This worked for Debian <= 9 at least when you have the lsb-release Debian package installed with distro.version(best=True) because lsb_release -a returned the major and minor version in the Release key:

$ cat /etc/os-release 
PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
NAME="Debian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
VERSION_CODENAME=stretch
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 9.12 (stretch)
Release:	9.12
Codename:	stretch

But with Debian >= 10 the Release key from lsb_release -a only has the major version:

$ cat /etc/os-release 
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 10 (buster)
Release:	10
Codename:	buster

For Debian >= 10 the only source for the minor version is file /etc/debian_version.

The /etc/debian_version file exists for years, even on older Debian versions, with a stable format (major.minor, with the exception that Debian <= 6 has major.minor.patch).

So maybe you can consider to parse /etc/debian_version to get the minor version.