$VERSION_CODENAME in Ubuntu

[timneedham]

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Is this a docs issue?

• [X] My issue is about the documentation content or website

Type of issue

Information is incorrect

Description

Hi,

This note:

If you use an Ubuntu derivative distro, such as Linux Mint, you may need to use UBUNTU_CODENAME instead of VERSION_CODENAME.

...didn't quite work for me on a plain Ubuntu install... UBUNTU_CODENAME isn't available as an environment variable, instead it's viewable via:

cat /etc/os-release

PRETTY_NAME="Ubuntu 22.04.2 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.2 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy

Location

https://docs.docker.com/engine/install/ubuntu/#install-using-the-repository

Suggestion

Maybe make mention to cat /etc/os-release in that note too?

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