Comment 30 for bug 1464917

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?