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I have asus n56vb with geforce 740 m and I just installed ubuntu 13.10, bumblebee with proprietary nvidia 319 driver, steam and dota 2. I can succesfully launch steam without optirun and with "optirun -b primus", but can't launch it with just optirun - here is console output.

As I understand the main problem is

primus: fatal: failed to load any of the libraries: /usr/lib/nvidia-319-updates/libGL.so.1:/usr/lib32/nvidia-nvidia-319-updates/libGL.so.1
/usr/lib/nvidia-319-updates/libGL.so.1: incorrect class ELF: ELFCLASS64
/usr/lib32/nvidia-nvidia-319-updates/libGL.so.1: unable to open shared object: No such file or catalogue

Then, if I open steam, I can launch dota 2, but I think it uses integrated video card (because I need to set all graphics options to minimal to get around ~40 fps). If I set "optirun -b primus %command%" or "optirun %command%" it doesn't launches at all.

So what should I do to make dota 2 execute on nvidia card? Here is my /etc/bumblebee/bumblebee.conf

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You have a typo in your bumblebee.conf file. In the line for the LibraryPath in the [driver-nvidia] section you have written,

LibraryPath=/usr/lib/nvidia-319-updates:/usr/lib32/nvidia-nvidia-319-updates

whereas by default the library would be present in,

LibraryPath=/usr/lib/nvidia-319-updates:/usr/lib32/nvidia-319-updates

Note the extra 'nvidia' in your line.

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