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Since the Update to 12.04 my battery won't charge - it says it's charged to 51% - when i disconnect the powercable thee is no energy supply at all.

How can i figure out if it's a hardware problem or the new ubuntuversion? And how can i fix it?

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Take a look at this question – Insperatus Sep 7 '12 at 1:14
I meant to also say updating the BIOS may help. – Insperatus Sep 7 '12 at 1:20

Try booting to a LiveCD or LiveUSB for the version you used to have installed. This way, you will be running on a completely independent instance of the operating system, so if the problem persists you know it is your hardware and not the software. You could also try a LiveCD for Ubuntu 12.04 to see if it is a configuration issue.

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