versin of linuxcnc

hello ; I was instal the ubunto linux but i not know what the version of linuxcnc software can be installed

Note that you need a real-time kernel to run linuxcnc.

Easiest is to use the offical Debian Buster ISO:
linuxcnc.org/downloads/

Then you could also try LinuxMint which is based on ubuntu if you need better driver support. But this is a bit more involved:
forum.linuxcnc.org/9-installing-linuxcnc...-easy-install#175816

thanks when i instal the linux debian ;linuxcnc is automatically installed?

No, linuxcnc is not installed with regular debian. The realtime kernel is also not installed with a regular debian installation.
The official ISO is debian with a realtime kernel and linuxcnc preinstalled. That's why it's the recommended method.