I recently installed Ubuntu 14.04 LTS on my laptop. Surprisingly battery backup has reduced to one third. Moreover it feels like my laptop is burning inside. Its bottom surface is way too hot than it used to be when I had Windows OS.
Can I fix it or I have to get back on to Windows OS (regretting my decision of switching to Ubuntu)
DELL latitude E5440
Intel i5-4200 CPU - 4GB RAM
no additional graphic cards (like AMD or NVIDIA)