Po-Hsu Lin as per your https://launchpadlibrarian.net/141770608/BootDmesg.txt :
[    0.304483] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored

Hence, as per http://www.dell.com/support/drivers/us/en/19/Product/vostro-5460 
an update is available for your BIOS (A07). 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 just provide the 
output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Thank you for your understanding.

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

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https://bugs.launchpad.net/bugs/1188025

Title:
  [Dell Vostro 5460] Right key on the touchpad is not working

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