What type of video card is installed on Ubuntu?

# lshw -C display
  *-display UNCLAIMED    
       description: VGA compatible controller
       product: Blade 3D PCI/AGP
       vendor: Trident Microsystems
       physical id: 5
       bus info: pci@0000:01:05.0
       version: 3a
       width: 32 bits
       clock: 66MHz
       capabilities: agp agp-1.0 pm vga_controller bus_master cap_list
       configuration: latency=64
       resources: memory:e5000000-e57fffff memory:


# lspci -v
02:00.0 VGA compatible controller: nVidia Corporation G71 [Quadro FX 1500] (rev a1) (prog-if 00 [VGA controller])
    Subsystem: nVidia Corporation Device 032c
    Flags: bus master, fast devsel, latency 0, IRQ 16
    Memory at d2000000 (32-bit, non-prefetchable) [size=16M]
    Memory at e0000000 (64-bit, prefetchable) [size=256M]
    Memory at d1000000 (64-bit, non-prefetchable) [size=16M]
    I/O ports at 5000 [size=128]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: <access denied>
    Kernel driver in use: nouveau
    Kernel modules: nouveau, nvidiafb


You can poke around Xorg log:

# more /var/log/Xorg.0.log