I was also affected by this bug, it is related to some FM2 motherboards , MSI 
being one of them.
The fix for this bug is to edit your GRUB file BEFORE you restart your system 
after updating.
If you did a clean install  from a live cd you will have to use f6 during boot 
and select "noapic" and if that fails try again and select"acpi=off"

You will still need to edit your grub file after boot up to make it permanent.  
from the terminal type;  gedit  /etc/default/grub

The file will open in the editor.
edit this line    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash '
  
to look like this;   GRUB_CMDLINE_LINUX_DEFAULT="quiet splash noapic" 

then save and exit, you are done..., enjoy!

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https://bugs.launchpad.net/bugs/1309578

Title:
  Ubuntu 14.04 suddenly reboots when booting from Live USB AMD A8 6600k

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