Comment 83 for bug 1310023

I was unable to switch to my Nvidia gtx 555m using prime indicator, bumblebee or manually through the nvidia server settings application. When changing with the command "$ prime-select nvidia" the terminal would show that the change occurred however I am positive this wasn't the case as I could not get a frame rate above 15 on a 64 emulator.
I managed to somehow fix this issue by doing the following: (quotations "" are only containing the contents of the commands I used, as none are used in them, so only enter whats inside them)

1.Remove primus, nvidia server settings and purge nvidia drivers:
"sudo apt-get remove --purge nvidia-*"

2.Install prime, prime indicator through the terminal
"sudo apt-get install nvidia-prime"
"sudo apt-get install prime-indicator
sysinfo with nvidia server settings as an add on through software centre

3. Install Nvidia driver 340.65 (http://ubuntuhandbook.org/index.php/2014/12/install-nvidia-340-65-ubuntu-1504/)

4. Change to Nvidia gpu using terminal command "sudo prime-select nvidia"

Note prime indicator and server settings both display that they're using Intel Integrated graphics however I get a solid 60 fps emulating, video's aren't laggy in general and what once was a black screen for some graphical programs now work fine.

ps I'm not sure if every install is necessary but I just listed what I did, I'm not experienced with Linux but no forums were helping me with my problem and I noticed a lot of people having the same issue. Sorry if this doesn't help you however I hope to ease your frustration as I did mine.