There is an /etc/apt/sources.list.d/ubuntu.sources.curtin.orig on the installed system

[Norbert]

Steps to reproduce:
1. Install the system using
  Ubuntu-MATE 24.04 LTS "Noble Numbat" - Beta amd64 (20240419)
2. Reboot the system and login to freshly installed system

Expected results:
* /etc/apt/sources.list and /etc/apt/sources.list.d/*.list are consistent

Actual results:
* the /etc/apt/sources.list.d/ubuntu.sources.curtin.orig file exists and does not belong to any package

[Norbert (nrbrtx)]

```
$ dpkg -S /etc/apt/sources.list.d/ubuntu.sources.curtin.orig
dpkg-query: no path found matching pattern /etc/apt/sources.list.d/ubuntu.sources.curtin.orig

```

[corrado venturini (corradoventu)]

On my Ubuntu noble ubuntu.sources.curtin.orig seems a copy of ubuntu.sources with comments that are missing in ubuntu.sources
attaching list of both