Not worry about it
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https://bugs.launchpad.net/bugs/1379764
Title:
System Hanged and Freeze
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Kamin Punpipat, thank you for reporting this and helping make Ubuntu better. As
per
http://www.dell.com/support/home/us/en/04/product-support/product/inspiron-14-3421/drivers
an update to your BIOS is available (A12). If you update to this following
https://help.ubuntu.com/community/BiosUpdate
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1379764
T