The latest, 20.04, perhaps not the standard Ubuntu, but one of the lighter flavors works better in old(ish) (and in your case very entry level even when it was released) hardware. Lubuntu, Xubuntu, Ubuntu-Budgie, even Kubunt are preferable to the standard Ubuntu (Gnome) because Gnome needs lots of resources and properly supported graphics.
Now that you have it working with an external keyboard it pretty much confirms an hardware problem. xUbuntu 20.04 won't solve that surely but it may now support your WiFi out of the box. If not please check the
Networking & Wireless section, namely the sticky threads "Before posting..." and the one about Broadcom if applicable. It easy to find right away if you have one of those (Broadcom) that always need user installed proprietary drivers just by running 'lspci' in terminal. That being the case just follow the instructions. If not Broadcom then please follow the instructions of the "Before posting..." thread and post a new topic in that section.
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