Keeping Linuxcnc 2.9 current on Debian Bookworm

If you followed the first post here, you should have downloaded the attached file, renamed it by removing the .txt extension
Then you should have copied that file to it's correct location.

Edited the above post, thank you.
It does work without setting priorities, for now, on Mate, but might not work later when repos update.
And you are right for Wayland, it has caused some hiccups for sure, with a lot of things, not just LinuxCNC.
Still, Wayland was by far the fastest on moving forward with porting everything possible to it, so i do not mind breaking LinuxCNC as it is not used as much as the Desktop stuff.
Forgot what was the exact issue with Wayland and LinuxCNC, nonetheless, i would blame much more QT and it's "dirty" programming much, much more. Python being right behind it in the "blame" section, they broke to much of everything.
And Rod, thank you for persisting with ... everything.
Now i have 3 laptops running BookWorm.

Yeh, I suspect the priority is undefined without the 99 rules Bound to bite one day!

The Wayland issue is described (and fixed for now) here:  github.com/LinuxCNC/linuxcnc/issues/2264
It is nothing to do with QT as Gmocappy was affected.

​​​​​​Keep it up Tommy. and you'll soon have more PC's running Bookworm than me!

Knowing your love of large monitors, and now you are running 2.9, I can highly recommend you play with qtdragon. Once you try it, you will never want to run Axis again

Mods, this can be unstickied as it's incorporated into 
forum.linuxcnc.org/9-installing-linuxcnc...c-on-debian-bookworm

I've tried to follow the steps listed in the hope of getting from 2.9.5 to 2.9.9, but the upgrade fails with the following error message:

Failed to fetch www.linuxcnc.org/dists/bookworm/2.9-uspa...pace_2.9.9_amd64.deb 404 Not Found [IP: 69.163.143.134 443]

What do I need to do?

Do not update/upgrade unless you explicitly need to.
2.9.9 is removed due to a bug sneaking in.