Recently my Lenovo z500 died a nvidia related death so I replaced the motherboard with an ebay one, it doesnt have an nvidia chip on it now, I swapped the same CPU over and installed Ubuntu 18.04 - was ok. Ubuntu 20.04 though? - NOT OK. Text looks fuzzy and it gives me some strain. Its better on 18.04 but that goes out of support soon. I also tried Kubuntu but this is similar.
I may try to put W10 on it but I dont think the hardware was ever supported as its quite old. (it had W8 on before the board swap) and this machine was fine for me to use with its built in and external screens on the HD4000 graphics. (but I would guess the external screens used the nvidia chip it had at the time - which it doesnt have now)