I've got similar graphics card issues. it used to work fine till I
went to Fiesty although at first look it seems to work it's not till
you try doing something which needs more fancy graphics do you begin
to realise the drivers obviously are not correct.

Anyone know where I can simply install the correct drivers for an
nVidia NV10DDR [GeForce 256 DDR] card or how I open/run a .run file ?

Before Fiesty all my programmes worked fine. I'm also having problems
with my LAN too I simply can not log into the workgroup. Fortunately I
have another Ubuntu machine I didn't upgrade so I can cross referance
things.