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gksudo nvidia-settings
I don't think 32-bit drivers would install on a 64 bit system, you should have 64 bit drivers. I *believe* the Ubuntu repositories have nvidia 180.** which is the same as on the official nvidia site (180.22) Just of out curiosity, what does version does nvidia settings say you have?? I personally wouldn't bothing doing the manual install of the official nvidia drivers.
However, if you really really want to:
You need to download the package, stop X
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sudo /etc/init.d/gdm stop
run it by
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sh NVIDIA**.pkg
Start x again,
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sudo /etc/init.d/gdm start