linux multi workstation
 

can 1 operation system of linux
can be use by 120 workers ?


their only do seo tasks mostly in the browser.

Yes.

What you are referring to is what's called a "thin client environment." The Benevolent Dictator of my LUG is a sysadmin at a hospital, where he administers just such a system using RHEL servers with, I think, 64 GB RAM. This was, in fact, the original model for networked environments, in which multiple "dumb" terminals accessed a single server.

Ubuntu has a good intro to how that works, though it references a very old Ubuntu version. The underlying concepts, though, are sound.

Check out PXE booting, (network booting).

thank you for the information