apt update error: "no longer has a Release file"

Someone with experience in Debian Linux admin probably knows what this means and how to fix it.  Sadly that's not me.

Installed LinuxCNC on a plasma table a few months ago.  Been a few weeks since I had it on due to travel.  Tried to do a package update today and got the following:

Notice: Repository 'xxxxxxxdeb.debian.org/debian trixie InRelease' changed its 'Version' value from '13.5' to '13.6'
Error: The repository 'xxxxxxxrepository.qtpyvcp.com/apt develop Release' no longer has a Release file.

Guessing it's something simple?  Machine works but I like to keep things updated so would like to resolve it.

Thanks! 

-Dave

cnc@linuxCNC:~/Desktop/test_plasma_1$ uname -a Linux linuxCNC 6.12.86+deb13-rt-amd64 #1 SMP PREEMPT_RT Debian 6.12.86-1 (2026-05-08) x86_64 GNU/Linux 
 

Tried again and now thinking some kind of network error.  Will try again later.

This repo is where probe basic et. al. live and it's been added as a convenience for users but its up to the qtpyvcp devs keep their repo current. I suspect its a transient issue from your message as I have not noticed issues here.

If you are not using any qtpyvcp stuff, you could delete the relevant qtpyvcp sources file in /etc/apt/sources.list.d
and do a sudo apt update