Yes,    I think deploying your script in the Deb file would be great.
Testing my memory now, the ISO builder simply places the keys in the archives 
folder but an earlier version of my rpi image builder shows the script for keys 
on lines 62-70:
 
https://github.com/rodw-au/rpi-img-builder-lcnc/blob/linuxcnc-2.9.1/files/userscripts/uscripts#L62
  
 
After that this should suffice
sudo apt update
sudo apt install  linuxcnc-ethercat

As per my forum sticky
https://forum.linuxcnc.org/ethercat/45336-ethercat-installation-from-repositories-how-to-step-by-step?start=0
  
 
Note:
1. The Ethercat key expires every 2 years and you may see warnings about this 
from apt.
2.The Ethercat packages require dkms and if secure boot (UEFI) is enabled, this 
requires enrolling dkms with a MOK   (Machine Owner Key) as discussed in a 
spoiler on the forum thread.
 
Rod
 
 
On 2025-12-09 07:30, andy pugh  <[email protected]>  wrote:
> On Mon, 8 Dec 2025 at 21:01, rodw  <[email protected]>  wrote:
>
> >  1. Migrate the Ethercat   installation instructions   in stickies on the 
> > forum (mostly authored by me) to the LinuxCNC documentation
> >  2. Include a script that installs the IgH repository and then installs the 
> > linuxcnc-ethercat driver
> >  I think this provides sufficient distance between linuxCNC and the ETG 
> > (who are very supportive of LinuxCNC)
>
> We can probably add the IgH repository at the same time as we add
> LinuxCNC in this script:
> https://www.linuxcnc.org/linuxcnc-install.sh
>
> Which I should add to the github somewhere, I suppose.
>
> This script also adds the (two) LinuxCNC signing keys from
> https://keyserver.ubuntu.com/
> However I can't see the IgH key there, maybe I have not tried the
> right search terms?
>
> --   
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1912
>
>
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