Hello Christopher,

testing the latest current Intel upstream kernel also has the bug. The
rc5 kernel is still the highest default kernel in my Grub2 boot menu, so
i had to use the [esc] key when booting up to manually choose which
kernel to load. After loading the Intel upstream kernel
4.6.0-994-generic my system was observed to have frozen like before. So
the bug is still present in the latest upstream kernel.

andrew@andrew-Inspiron-3451:~$ uname -r
4.6.0-994-generic
andrew@andrew-Inspiron-3451:~$ uname -a
Linux andrew-Inspiron-3451 4.6.0-994-generic #201604292201 SMP Sat Apr 30 
02:03:11 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
andrew@andrew-Inspiron-3451:~$ 

---

However i decided to also try the oldest available kernel in my my Grub2
boot menu. That kernel happens to be 3.16.0-70-generic which i assume is
the kernel i had in ubuntu 14.04 which had no problems. after briefly
testing this old kernel so far i have seen no problems whatsoever. Until
i see otherwise i will conclude that the bug was introduced somewhere
after kernel 3.16.0-70-generic. (for those following this bug report
with the same problem as me it might be prudent to use this old kernel
until someone can fix this bug).

andrew@andrew-Inspiron-3451:~$ uname -r
3.16.0-70-generic
andrew@andrew-Inspiron-3451:~$ uname -a
Linux andrew-Inspiron-3451 3.16.0-70-generic #90~14.04.1-Ubuntu SMP Wed Apr 6 
22:56:34 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
andrew@andrew-Inspiron-3451:~$

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https://bugs.launchpad.net/bugs/1575467

Title:
  Ubuntu 16.04 consistently freezes up / hangs

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