I will preface this by saying that I am about as far as it gets from being an expert in Linux.
This seemed to be a long winded method of installing Linuxcnc on Bookworm. This may have meant you missed out on some things.
I would start with the Bookworm non-free iso
cdimage.debian.org/cdimage/unofficial/no...onfree/amd64/iso-cd/
I would only use dist-upgrade if I wanted to update from say Bullseye to Bookworm so the commands become
Code:
sudo apt update (this just refreshes the repo index after install)
sudo apt upgrade (this will bring you up to the current bookworm from the alpha iso released sept 2021)
sudo apt install linuxcnc-uspace linuxcnc-uspace-dev mesaflash (install all the linuxcnc components)
Downgrading to the 5.10 kernel on Bookworm (now kernel 6.1) makes no sense as that is the kernel included in Bullseye. This probably explains you missing dependencies
Note that there is no need to install the RT kernel as its a dependency of linuxcnc-uspace so it gets installed automatically with linuxcnc.
Finally, the instructions are for Bookworm (Debian 12) and you actually installed on Bullseye (Debian 11)
Unfortunately some of the gnipsel stuff is dated..
