I installed Ubuntu 16.04 in a Lenovo thinkpad e550 and i have a problem: the battery doesn't charge, the icon on the panel doesn't indicate it's charging, and in "Power Statistics" -> "Laptop Battery" state is "discharging".
This laptop hasn't been used for some months, if that helps. Any idea?
EDIT: I let the computer fully discharge. I was then able to charge it with no problems. Now I'm back at 100% and even if the power adapter is connected, the battery is still discharging and in the panel the indicator says "19:48 left".