Sounds like you need to install the extension pack for your upgraded VB.
https://www.virtualbox.org/wiki/Downloads

On Sun, Feb 4, 2018 at 6:51 PM, Tony Schlemmer <aschl...@comcast.net> wrote:

> My base OS is Win7 and I run a guest operator system of Ubuntu 16.04 LTS.
> My Ubuntu would not boot. Win7 works fine.
>
> Tony
>
> > On Feb 4, 2018, at 18:42, Denis Heidtmann <denis.heidtm...@gmail.com>
> wrote:
> >
> > I am not  sure I interpret you comments correctly, but Win2k is my guest;
> > Ubuntu 16.04 is the host.  Ubuntu runs fine.  Are you suggesting that I
> > would need to install the Host to fix the Guest (or VB, whichever is  the
> > culprit)?
> >
> >
> >> On Sun, Feb 4, 2018 at 5:58 PM, Tony Schlemmer <aschl...@comcast.net>
> wrote:
> >>
> >> I have window 7 laptop for work and when I tried to upgrade to Virtual
> Box
> >> 5.2.6 with a Ubuntu 16.04 LTS it ran for a day. When left work I
> shutdown
> >> the VirtualBox. When I tried restarting Ubuntu the next day I got
> nothing.
> >> The logs were empty. I had no choice but to create another 40GB
> partition
> >> with Ubuntu and down load every again.
> >>
> >> Now I have memory card that back everything up on so if it happens
> again I
> >> at least have my files. VirtualBox worked perfectly for 6 months. We use
> >> GIT so I checked in my code changes in daily but I spent about 6 hours
> >> reinstalling everything.
> >>
> >> Tony
> >>
> >>> On Feb 4, 2018, at 17:40, Denis Heidtmann <denis.heidtm...@gmail.com>
> >> wrote:
> >>>
> >>> As soon as I click on start, the computer freezes--no mouse, no
> keyboard
> >>> reaction.  The power button is all I could find to break the ice.
> >> Reliably
> >>> repeatable.  The VB logs are empty.
> >>>
> >>> My laptop  has the same OS (Ubuntu 16.04), same VBox, same win2k guest;
> >>> works fine.  I have tried to compare the settings between the two
> >> systems,
> >>> and they are almost alike.  What I see different that seems unusual is
> >> that
> >>> the desktop system under Storage/IDE controller shows Win2kSP2
> Clone.vdi
> >>> and Empty for the Secondary Master, whereas the laptop shows
> >>> VboxGuestAdditons_5.0.18.iso  I was certain that I installed the guest
> >>> additions on the desktop.  VB had run fine up until this latest
> >> attempt.  I
> >>> will go looking for the guest additions.
> >>>
> >>> I would appreciate ideas on how to investigate this.
> >>>
> >>> -Denis
> >>> _______________________________________________
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> >>
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> >>
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