[Bug 2065040] [NEW] Drop UBUNTU_CODENAME from /etc/os-release. Use VERSION_CODENAME instead

[Benjamin Drung]

Public bug reported:

Bug #1520154 introduced UBUNTU_CODENAME, but the final name that landed
in the os-release specification is VERSION_CODENAME. Ubuntu specifies
VERSION_CODENAME since Ubuntu 16.04 "xenial" (see bug #1598212).

So let's finally drop UBUNTU_CODENAME from os-release starting with
Ubuntu 24.10 "oracular".

Marking snapd as affected since it uses UBUNTU_CODENAME in some files in
tests/.

** Affects: base-files (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: snapd (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: snapd (Ubuntu)
   Importance: Undecided
       Status: New

** Summary changed:

- Drop UBUNTU_CODENAME from /etc/os-release
+ Drop UBUNTU_CODENAME from /etc/os-release. Use VERSION_CODENAME instead

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https://bugs.launchpad.net/bugs/2065040

Title:
  Drop UBUNTU_CODENAME from /etc/os-release. Use VERSION_CODENAME
  instead

Status in base-files package in Ubuntu:
  New
Status in snapd package in Ubuntu:
  New

Bug description:
  Bug #1520154 introduced UBUNTU_CODENAME, but the final name that
  landed in the os-release specification is VERSION_CODENAME. Ubuntu
  specifies VERSION_CODENAME since Ubuntu 16.04 "xenial" (see bug
  #1598212).

  So let's finally drop UBUNTU_CODENAME from os-release starting with
  Ubuntu 24.10 "oracular".

  Marking snapd as affected since it uses UBUNTU_CODENAME in some files
  in tests/.

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