I ran
dpkg --get-selections | grep linux-image
 to find old installations of the kernel images such as: 
linux-image3.19.0.15-generic the purged them with this command

sudo apt-get purge linux-image-3.19.0-15-generic

I did this for all old linux-images in the list from the dpkg --etc command 
above
I deleted all but the current and the next most current, there were two 
linux-image-extra...etc that needed to be purged as well.  These were listed 
with a "deinstall" parameter in the dpkg --etc list.  I am not sure why those 
needed special attention but the rest auto purged the linux-image-extra...etc 
packages with the single: sudo apt-get purge linux-image-3.19.0-xx-generic 
command
 
I then upgraded to 15.10 and I no longer have the "Reached target Shutdown" 
hang issue...at this time, caveat it hangs for a few seconds but not 
indefinitely for me.

These are the only images currently installed now:

dpkg --get-selections | grep linux-image
linux-image-3.19.0-49-generic                   install
linux-image-4.2.0-27-generic                    install
linux-image-extra-3.19.0-49-generic             install
linux-image-extra-4.2.0-27-generic              install
linux-image-generic     

I would be interested if others have tried this?

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https://bugs.launchpad.net/bugs/1464917

Title:
  reboot hangs at 'Reached target Shutdown'

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