It is not supposed to reboot, you should do that manually.
Actually, you don't have to reboot, logoff/logon is enough.
If you would like to automate the process, refer to prime-indicator package.
Instalation guide can be found on the following link (valid on March 19, 2015):
http://www.webupd8.org/2014/01/prime-indicator-lets-you-quickly-switch.html .
** Changed in: nvidia-prime (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1389199
Title:
NVIDIA-340. 46 and NVIDIA 331.38
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