noting that the 5.1.18 update won't install as an update to the 5.0 version,--
First, I determined to remove virtualbox. just apt-get remove virtualbox doesn't work. I had to find out the package name that was installed:
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dpkg --get-selections | grep -v deinstall
this revealed, among much other stuff :
virtualbox-5.0 install
virtualbox-guest-dkms install
virtualbox-guest-utils install
virtualbox-guest-x11 install
virtualbox-nonfree install
working from that i used this command to remove virtualbox-5.0
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$ sudo apt-get remove virtualbox-5.0
following that i switched to the directory where i have the .deb that Virtualbox downloaded using the link provided by the earlier version:
virtualbox-5.1_5.1.18-114002~Ubuntu~trusty_amd64.deb
from there I installed the new .deb
( I made sure the one deb was the only one in the directory i was working from )
this went normally; after that, when i started VirtualBox I was prompted for the EXTENSIONS. I just followed the prompts and let it install the Extensions.
after this my existing guest machine ( Win8.1 ) fired up -- and died. I started it again and this time it let me go to DEVICES and INSERT the Guest Additions. With the Guest Additions in the (pseduo) CD drive I was able to install the Guest additions. This ended requiring a reboot of the guest machine.
however at this point I have Photoshop/Elements running in the Guest VM,-- so -- it looks like I have Crossed the Rubicon and become a VB 5.1 user.