Can't access vgaswitcheroo file, access denied?

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http://askubuntu.com – Hi I'm trying to change my integrated graphics card to my discrete graphics card (Nvidia GeForce 540m) and when I use the vgaswitcheroo method, I can't access the file doing this: $ls -l /sys/kernel/debug/vgaswitcheroo/switch ls: cannot access /sys/kernel/debug/vgaswitcheroo/switch: Permission denied This is the link to the guide on using vgaswitcheroo I'm using: https://help.ubuntu.com/community/HybridGraphics I'll be using Nvidia Unix Drivers because I'll be playing with the graphics card. Any help? Thanks. Ps. I'm new at Ubuntu, any help would be appreciated. (HowTos)