/etc/os-release

file included in base-files package in Ubuntu.

source /etc/os-release

Related

• lsb_release -a
• /etc/redhat-release
• /etc/fedora-release
• /etc/*release
• apt-get install --reinstall base-files

See also

• lsb_release, lsb_release --help, lsb_release -cs, /etc/*release, /etc/issue, hostnamectl, uname
• Linux distributions: Debian, Ubuntu, RHEL, Amazon Linux, Oracle Linux, ArchLinux, SUSE