[PLUG] update took out display resolutions, system ignores xorg.conf

[Greg Helledy <gregsonh@gra-inc.com>]

I've been using Linux Mint 17 (Ubuntu 14.04 derivative) in a VirtualBox 
VM for years.  Yesterday I ran an update (apt-get update, apt-get 
upgrade -u).

On reboot, the system no longer has any X resolutions other than 
640X480.   Poking around doesn't reveal where the list of resolutions is 
kept, there is no xorg.conf.

I found this Mint-specific page about how to create one, dutifully 
follow it, and...nothing.
https://community.linuxmint.com/tutorial/view/877

The system ignores the existence of /etc/X11/xorg.conf  It's not 
user-specific, I created another user and I only have the choice of 
640X480 there as well.

I do have the VirtualBox addons installed, and the update did include a 
kernel update (4.4.0-22-generic).

So, it's 2016 and I still can't update my computer without wondering 
whether it will work afterwards.

Any suggestions on what to do at this point?  Is there some other secret 
hidden file that controls what resolutions are available?

--
Greg Helledy
GRA, Incorporated
P:  +1 215-884-7500
F:  +1 215-884-1385
www.gra.aero
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