[Bug 2058741] Re: On a new desktop install apt complains about ubuntu.sources.curtin.old

[Olivier Gayot]

Hello Seb. Thank you for your bug report,

Indeed, during installation, curtin apt-config backs up the original
ubuntu.sources file before making modifications:

https://github.com/canonical/curtin/blob/master/curtin/commands/apt_config.py#L650

I suggest we either remove it completely or use a different extension.
By default on noble, the following extensions should be ignored without
warning:

$ apt-config dump | grep -F Dir::Ignore-Files-Silently
Dir::Ignore-Files-Silently "";
Dir::Ignore-Files-Silently:: "~$";
Dir::Ignore-Files-Silently:: "\.disabled$";
Dir::Ignore-Files-Silently:: "\.bak$";
Dir::Ignore-Files-Silently:: "\.dpkg-[a-z]+$";
Dir::Ignore-Files-Silently:: "\.ucf-[a-z]+$";
Dir::Ignore-Files-Silently:: "\.save$";
Dir::Ignore-Files-Silently:: "\.orig$";
Dir::Ignore-Files-Silently:: "\.distUpgrade$";


** Changed in: curtin
       Status: New => Triaged

** Changed in: curtin
   Importance: High => Medium

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https://bugs.launchpad.net/bugs/2058741

Title:
  On a new desktop install apt complains about ubuntu.sources.curtin.old

Status in curtin:
  Triaged

Bug description:
  Installing Ubuntu Desktop Noble daily with the default options (no
  encryption, using the only available disk in the VM), on the installed
  system apt displays those warnings

  > N: Ignoring file 'ubuntu.sources.curtin.old' in directory
  '/etc/apt/sources.list.d/' as it has an invalid filename extension

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