Installing samba

I want to install samba, but apt install samba gives "Package 'samba' has no installation candidate", I did apt update but it didn't help. I checked repositories and there is only linuxcnc.org. Should I have also Debian repositories or not? How to install samba?

Also do I need: "download.opensuse.org/repositories/science:/EtherLab/Debian_12/"? What is it for? It gives an error on apt update:
"Get:1 download.opensuse.org/repositories/science:/EtherLab/Debian_12 ./ InRelease [1,575 B]
Err:1 download.opensuse.org/repositories/science:/EtherLab/Debian_12 ./ InRelease
  The following signatures were invalid: EXPKEYSIG A94819A7CB97A204 science:EtherLab OBS Project <science:EtherLab@build.opensuse.org>
Hit:2 repository.qtpyvcp.com/apt develop InRelease                                              
Hit:3 www.linuxcnc.org bookworm InRelease                                                       
Reading package lists... Done                      
W: GPG error: download.opensuse.org/repositories/science:/EtherLab/Debian_12 ./ InRelease: The following signatures were invalid: EXPKEYSIG A94819A7CB97A204 science:EtherLab OBS Project
E: The repository 'download.opensuse.org/repositories/science:/EtherLab/Debian_12 ./ InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details."

 

You only need the Ethercat repos if you are going to use Ethercat .
Debian sources
gist.github.com/hakerdefo/5e1f51fa93ff37871b9ff738b05ba30f

Installing samba
serverspace.io/support/help/configuring-samba-on-debian/

I'd thought I'd add samba and windows can be a PITA to setup.
As the underlying OS is Debian bookworm, any guides or how-tos that cover installing samba on Debian will be far far better than asking here.
I would also install gvfs-backends and gvfs-fuse as well. Samba-vfs-modules might be an idea as well.

unknown wrote:

I'd thought I'd add samba and windows can be a PITA to setup.
As the underlying OS is Debian bookworm, any guides or how-tos that cover installing samba on Debian will be far far better than asking here.
I would also install gvfs-backends and gvfs-fuse as well. Samba-vfs-modules might be an idea as well.

The roadblocks with samba are all on the Windows side. You need to add a policy that permits the older version of SMB ptotocol.