Ubuntu Software Center installer
Of course you can, but your stuck with whatever version the Ubuntu people decide to make their current stable.
Linux is typically an OS that requires a bit more than "novice" knowledge about all things computer. Some OS shells such as Ubuntu, try to dummy it down for the masses, but you have to conform to what they deem appropriate or know how to work around it.
None of this helps you get the version your wanting to install though. Using the download_and_compile.sh script or the available PPA type installation should be the next easiest way to get what you want. But it does require some self education to use even these tools to get the version of FG you want. Maybe someone with more time available will step up and walk you through one of these tools. Or try searching the wiki for either of them. Last i looked they were adequately documented.
Kansas and Ohio/Midwest scenery development.
KEQA, 3AU, KRCP Airport Layout
Intel i7/GeForce RTX 2070/Max-Q