i don't have connection

Sorry i didn't found a solution to my problem.
I installed linuxcnc and the installer gave to me some problems.
i cannot install grub, although i found solution with this, and i cannot do the installation with connection, with wifi and eth neither
so i done the installation anyway but now i don't have connection.
i bought one wifi intel 9560, and the module is load i think "iwlwifi".
and i bought one mesa 7i95 and i cannot get connection too, and all the places i found for get this connection i need download some tools, but i don't have connection.
Someone had the same problem? maybe is a problem of networkmanager configuration? someone can help me? i have mounths with this problem and i cannot get a solution, i am new with this i cannot start to do this project.
and maybe i would like get some leasons about linuxcnc, find a teacher would be great, i can pay the leasons.
Thanks.

1. What IP address is the 7I95 using? (192.168.1.121 or 10.10.10.10)
(10.10.10.10 is suggested)
2. What does the command

ip a

(typed in a terminal window)

return?

i used 10.10.10.10
but the command ip a just return lo
not eth0

Did you try setting up the Ethernet with network manager?

What is the name of your Ethernet interface?

(it may well not be eth0)

the applet networkmanager in desktop not work, the letters are grey and i cannot click
i went to /etc/network/interfaces
and there i wrote:

auto eth0
iface eth0 inet static
address 10.10.10.10
netmask 255.255.255.0
gateway 10.10.10.1

But i think is a drivers problem because not detect, wifi and ethernet neither.
although iwlwifi and e1000 modules are charged.
i don't know...

i tried all this ip for address
but nop, not work
i tried install a usual debian in the same computer and it is giving to me the same problem.
so i am thinking use ubuntu or arch.
i will try install preempt-rt and linuxcnc there.
some suggest, advice or tip?

My guess is drivers required for your network interface do not exist in Debian Buster.
Tell us about your PC make, model, network interface if known
I would recommend you try to  install debian testing (bookworm) from this download
cdimage.debian.org/cdimage/unofficial/no...builds/amd64/iso-cd/

once installed (assuming the network driver is found) type these lines:
sudo apt update
sudo apt install linuxcnc-uspace linuxcnc-uspace-dev mesaflash 
linuxcnc

Motherboard Biostar racing z490 gtn mini itx
socket 1200 with intel pentium gold cpu
lan Intel i219V
wifi intel wirless 9560
gpu radeon rx 550

i will try what you say.
but for the moment i installed arch with a kernel real time and linuxcnc work there.
i am new in linuxcnc and i must learn how work all the configs and hal...
do you think will be difficult make work 7i95 with arch?