Po-Hsu Lin, as per 
http://www.dell.com/support/drivers/us/en/19/Product/vostro-5560 an update is 
available for your BIOS (A05). If you update to this following 
https://help.ubuntu.com/community/BiosUpdate , does it change anything? If it 
doesn't, could you please both specify what happened, and provide the output of 
the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Thank you for your understanding.

** Tags removed: bios-outdated-a01
** Tags added: bios-outdated-a05

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1182836

Title:
  [Dell VOSTRO 5560] When unplugged, hibernate will cause system failed
  to suspend

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