intalling Linuxcnc from source

So I triend Linux Mint, got errors so I switched to Debian.

I used sudo grub-customizer to use RT kernel.

Then I created folder, where I wanted to download git clone as is written in Building LCNC. linuxcnc.org/docs/html/code/building-linuxcnc.html

But I get again some errors, which I was previously on Ubuntu solve, but now with searching (just fast tbh) Iam not able to solve this. Iam connected via ethernet to internet.
 

 

Disconnected during download, try again and again till you get no error.
Also, i would change the network cable.

Still getting same errors. Are there any other ways how to download the same things as with this git clone command? I absolutely dont understand why it doesnt work - internet connection with cable was never problem.

github.com/LinuxCNC/linuxcnc
Green button with "code" click on it then download zip

Okey so I was able to download from the git using git clone.

Now Iam following this guy:

I had some errors that I have been able to solve, but now I get this error after using
 
 

 

I was able to solve the problem just by using sudo sudo dpkg-buildpackage -b -uc