Something eerily similar happened to me on Tuesday. I've been running Ubuntu in VMware for several months for development in Qt targeting a small device. After accepting available updates, I agreed to "restart now." It failed to boot. A more Linux-knowledgeable colleague got it working again for me. He backed out the kernel update, which in my case was linux-image-3.19.0.51-generic. Here’s a possibly helpful link: boot - How to delete a non-working kernel after update? - Ask Ubuntu[^]
BDF The internet makes dumb people dumber and clever people cleverer. -- PaulowniaK