I'm not using Ubuntu at the moment, but i think it's relevant.  
On recent kernels there is no /proc/acpi/fan or /proc/acpi/thermal. Instead 
there are /sys/devices/virtual/thermal/cooling_deviceX and 
/sys/devices/virtual/thermal/thermal_zoneX, or something like that. I didn't 
managed to get workaround scripts working, but:
rmmod thermal;
modprobe thermal  tzp=1000; (or other numer, tzp - Thermal Zone Polling 
frequency, units are in deci-seconds)
sometimes running above commands fix it for me, but then again, sometimes it 
don't...

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https://bugs.launchpad.net/bugs/77370

Title:
  Laptop Fan always on after resume from suspend to RAM

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