Thanks broadmind (gustavo-vegas).
I also have a same problem lockup during boot with newly installed updates 
today (4/4/2018). The kernel version is 4.4.0-119-generic #143. I also tried to 
boot with an older one (4.4.0-116 perhaps)to no avail. I can only boot in 
upstart mode on these kernels, also there were no problems when loading 
4.4.0-112.
Adding "noibpb" to GRUB_CMDLINE_LINUX= in /etc/default/grub allowed the machine 
to boot fully without problems.

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https://bugs.launchpad.net/bugs/1745349

Title:
  Hard lockup during boot with linux-image-4.4.0-112-generic

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