It appears that you have installed Ubuntu Server, version 16.04.3 and that this is not what you had intended. The server versions of Ubuntu do not have a pre-installed desktop.
Based on what you have told us of your computer, I would suggest Lubuntu, a lighter version of Ubuntu for your computer, but regular Ubuntu or Ubuntu-Gnome should work as well. You will need to download the 'desktop' versions of Ubuntu, and install one of them.
All of the Ubuntu versions can be found at http://cdimage.ubuntu.com/, and a guide to installing Ubuntu is on AskUbuntu at How do I install Ubuntu?
Some helpful links:
Lubuntu downloads
Ubuntu downloads
Ubuntu-Gnome downloads
free -T
at the $ prompt you are seeing. – WinEunuuchs2Unix Aug 25 '17 at 17:16forcepae
. And that computer should work with both 32-bit and 64-bit operating systems. But I agree with @CharlesGreen, that Lubuntu would be better than standard Ubuntu because the graphical desktop environment of Lubuntu has a lighter foot-print and will work much better with old hardware. – sudodus Aug 25 '17 at 19:26