I installed 14.04 a month ago and have not been able to get my Nvidia graphics card to work since that time. Currently the system thinks it is using the Nvidia driver.
lshw -c video is as follows :
description: VGA compatible controller product: NV36 [GeForce FX 5700] vendor: NVIDIA Corporation physical id: 0 bus info: pci@0000:01:00.0 version: a1 width: 32 bits clock: 66MHz capabilities: pm agp agp-3.0 vga_controller bus_master cap_list rom configuration: driver=nvidia latency=32 maxlatency=1 mingnt=5 resources: irq:16 memory:f8000000-f8ffffff memory:e0000000-efffffff memory:f9000000-f901ffff
and the Additional Drivers tab in Software Updates says my NV36 (Geforce FX5700) is using Nvidia legacy driver version 173.14.39.
But the computer graphics is terribly slow, ie CPU is pretty much running at 100% and the System Overview tells me I am using Graphics Driver Gallium 0.4 on llvmpipe(LLVM 3.5, 128 bits).
I have read the answers to many similar problems in askubuntu and I have tried all the likely solutions but without success. Can anybody suggest anything to try? I am not a very experienced Linux user so it has to be a fairly detailed answer (sorry about that).