Hello, my GPU used to run at 45-50C while watching HD videos in Windows XP and now according to psensor it's running at 60-65C while doing basic web browsing in Lubuntu 16.04.1. My CPU is just as cool as it always was (35-45C) and its usage looks mostly normal.

Here are some of my specs:
HP Mini 311-1000 (my mom bought it new in 2009)
GPU: nVidia ION GeForce LE 1300
CPU: Intel Atom n270

I tried Bumblebee with no success yesterday and I'm not sure what to do. The rest of the system is running great so this is mighty disappointing.

Linux is very new to me, so any advice would be appreciated. Thank you!