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Try this
forum.linuxcnc.org/9-installing-linuxcnc...-2-9?start=40#308037
And follow from there on.
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Getting permission denied from apt is strange, especially since you are correctly running as a normal user.
In about 90% of cases, if you get this error, one of the memory modules is on the way out, so it might be time to dust off your PC and check the memory.
If you do have another PC, you can install everything there and move the drive after finishing to this PC, that almost always works properly with Linux. Almost for me is 1 failed boot in about 500.

reading this might explain why it is returning a local minimum:
www.gnu.org/software/gsl/doc/html/multimin.html

 

So in my opinion we are using the wrong solver.

Is there a particular reason for using 'Multidimensional Minimization' instead of 'Nonlinear Least-Squares Fitting' which would contain the dogleg method?

// Set up the Nelder-Mead solver
const gsl_multimin_fminimizer_type *T = gsl_multimin_fminimizer_nmsimplex2;
gsl_multimin_fminimizer *s = gsl_multimin_fminimizer_alloc(T, 3);

UPDATE:
i did again a fresh install of Debian 12 and did the same as described in my previous post with sudo dpkg -i (package name here without brackets).
I then opened Synaptic pacakge manager and it showed me a broken package, which was linuxcnc. I clicked on it and did complete removal. Then i updated everything that synaptic made available and then again i did sudo dpkg -i linuxcnc_2.9.4_amd64.deb.
When i do Latency-test, the pc freezes.

I dont get it, but this is the best example of why i just hate linux.

If i did something wrong or without a sequence, then i need to remember, that the only information i got from first post of forum.linuxcnc.org/9-installing-linuxcnc...debs-for-2-9?start=0, is that i have to have Debian 12 installed, without Linuxcnc.
Then i download the DEBs of onelaboratories.us/abc/linuxcnc_2.9.4_amd64.deb
and each of the 4 DEBs i need to install by "sudo dpkg -i (deb name)".

This does not work.
On start up of the machine i get for about 2 seconds the information that you can see on the attached picture.

I've added support for the 7i76EU, just need to figure out what features it has over the 7i76E. Good to know the pin names are the same.

JT

The RS274NGC_STARTUP_CODE IMHO is not really needed for anything because your preamble in the NC file will over write the startup code. If you run the Axis sim which does not have RS274NGC_STARTUP_CODE you can see the default start up codes G80 G17 G40 G20 G90 G94 G54 G49 G99 G64 G97 G91.1 G8 G92.2 M5 M9 M48 M53 M0 F0

JT