Debian 11

Debianバージョンを確認
# cat/etc/debian_version
11.1

# cat/etc/issue
Debian GNU/Linux 11 \n \l

# lsb_ ...

環境
Debian 11.0

方法1
# cat/etc/debian_version
11.0

方法2
# cat/etc/issue
Debian GNU/Linux ...