Make ubuntu_setup.sh use codenames to support Ubuntu based distros #25261
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Using codenames allows the ubuntu_setup.sh to install
properly on systems like Pop!_OS or Linux Mint.
Description
The change switches from ID and VERSION_ID to VERSION_CODENAME.
This makes the setup work on systems based on Ubuntu, as the codename still matches.
The relevant functions were also changed to reflect the codenames, as both 22.04 (jammy) and 20.04 (focal) are LTS.
Verification
Run the ubuntu_setup.sh on Pop!_OS 22.04