Ubuntu – Ubuntu 14.04 does not recognize the battery

For the last 3 years I've been using a Samsung notebook. I was using Ubuntu 13.10 until 2 weeks ago. Then I decided to format and install Ubuntu 14.04 LTS.

Everything was working great, until the third day, when I did not do anything else than installing the software updates, I noticed my battery was not being recognized. The battery indicator shows charging, and when I click it it just says Battery. The day started to malfunction just said unknown battery, and when I unplugged my laptop it shut down.

If a try to turn on my laptop with the battery in and not plugged into an AC adapter, it does not turn on: it only works when its plugged in. Also, when its plugged in with the battery the light showing the battery status is now always switching from green to red (which it never did before).

I guessed it was just my battery dieing, so I tried in another notebook like mine and was working perfectly, full battery, 3 hrs and a half running. How can I get Ubuntu to recognize my battery? I really don't want a laptop that is a portable PC, I need a portable laptop again.