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I got to understand that HP dv6 series aren't the best choice for ubuntu. The problem is the battery. If I disconnect the cable everything dies instantaneously. What can I do ?

I suppose you'll ask me something like this:

$> upower -i /org/freedesktop/UPower/devices/battery_BAT0

  native-path:          /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0A:00/power_supply/BAT0
  vendor:               Hewlett-Packard
  model:                Primary
  power supply:         yes
  updated:              Sat 07 Dec 2013 04:52:16 PM CET (12 seconds ago)
  has history:          yes
  has statistics:       yes
    present:             yes
    rechargeable:        yes
    state:               charging
    energy:              0 Wh
    energy-empty:        0 Wh
    energy-full:         47.52 Wh
    energy-full-design:  47.52 Wh
    energy-rate:         0 W
    percentage:          0%
    capacity:            100%
    technology:          lithium-ion

Many thanks (in advance)!

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Are you certain it's not the battery that is the issue? – DeeJayh Dec 7 '13 at 17:01
You mean a "dead" battery ? I cannot know for sure, it is a second-hand computer. Is there a way to check that ? If not, I can try to buy a new one, but I'd rather be sure first. thanks – Karl Dec 8 '13 at 12:49
Start the computer and unplug it from the wall, if it dies immediately or within a couple minutes the battery is dead... – DeeJayh Dec 9 '13 at 1:36
Is it that simple ? Ok that would make sense. Actually I can't even boot at all. Maybe I did not want to see this possibility. Thanks guys. – Karl Dec 9 '13 at 10:00
No problem, I'll write it in an answer below for future members with this issue, please click the check mark next to it to accept it as the answer to your question. – DeeJayh Dec 9 '13 at 23:31
up vote 0 down vote accepted

The battery has probably bit the dust, if you unplug from AC power (a wall outlet) and the computer shuts off immediately or relatively fast (within a few minutes) you can assume the battery needs replaced with relative certainty.

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