How to monitor CPU/GPU/HDD Temperature and Fan Speed in Linux

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psensor

How to install on Linux Mint/Ubuntu:
1. Add this PPA to Software Sources: ppa:jfi/ppa
2. Click Update the Cache/Reload in Ubuntu.
3. Install lm-sensors and hddtemp from Software Manager/Center. (lm-sensors and hddtemp is pre-installed in Linux Mint.)
4. Type "sudo sensors-detect" in Terminal and then type "sensors" to verify.
5. Install psensor from Software Manager/Center.
6. Run psensor from Start Menu.

Also see:
How To Check Laptop CPU Temperature In Ubuntu