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The conflicting version 3.2.1-90~trustyppa1 is coming from the stable PPA. Unless you need some specific feature from that version you could remove the PPA and use the version that comes with utopic by default: sudo ppa-purge ppa:bumblebee/stable sudo apt-get update sudo apt-get install bumblebee-nvidia


Go to System Settings > Software & Updates > Additional Drivers Choose your preferred drivers. With Bumblebee if you want to run an application using dedicated graphics use: optirun <AppName>

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