What if you use xrandr in the host to force the video resolution? Something 
like this:

xrandr --output LVDS --auto --output VGA-0 --mode 1920x1200 --right-of LVDS

Tom


On Monday, October 16, 2017 12:36:16 PM EDT Jonathan Pratschke wrote:
> Dear Christoph,
> 
> thanks for your help - I'm afraid using the <Host> - F and other options
> has no impact. I connected an external monitor, and it wouldn't
> recognise the appropriate resolution of that either (1920x1200), so I am
> starting to think that this may have to do with the combination of
> KUbuntu 17.04 and VirtualBox 5.1.22. But I don't want to go back to
> previous distributions/versions just to make VB work - if there is a
> bug, presumably it will have to be resolved. If there is a solution, it
> would be nice to work out what it is! I have Virtualbox 5.0.26 on
> KUbuntu 16.04, on a different PC, which works perfectly.
> 
> Thanks,
> Jonathan
> 
> Il 16/10/2017 09:18, Christoph Schmees ha scritto:
> > Am 16.10.2017 um 06:34 schrieb Patrice Oliver:
> >> Hi,
> >> 
> >> I have the dame problem with my dell xps13 which provides a bigger
> >> resolution than virtualbox capabilities.
> >> 
> >> No way for me too.
> >> 
> >> Either virtualbox is abble to, either we have to search another
> >> emulator.
> >> 
> >> Regards.
> >> Patrice.
> > 
> > to both of you: What happens on <Host Key>-F (Fullscreen)? Wait a
> > moment until the picture is adjusted!
> > ((<Host Key> defaults to the Crtl-Key on the right side.))
> > In some cases I finally reached my goal by cycling thru the "view"
> > options (<Host Key>-F, -C, -L). Each of them is a toggle.
> > 
> > hth.
> > Christoph
> > 
> >> Le dim. 15 oct. 2017 à 21:47, Jonathan Pratschke
> >> 
> >> <[email protected] <mailto:[email protected]>> a écrit :
> >>      Dear all,
> >>      
> >>      I am using VirtualBox 5.1.22 on a Lenovo X1 Carbon 5th
> >>      generation, which
> >>      is running KUbuntu 17.04. The screen resolution is 2560x1440.
> >>      
> >>      I have created two virtual machines, one with Win7 and the other
> >>      with
> >>      Win10, but neither will adapt to the resolution of the laptop
> >>      (neither
> >>      in terms of proportions, nor size), despite having successfully
> >>      installed the guest additions.
> >>      
> >>      All attempts to condition the VMs have failed. At the end of the
> >>      installation, the desktop of the VMs appears small and
> >>      surrounded by a
> >>      black margin to the right and below. I have tried the
> >>      File-Environment-Display settings, auto resize guest, using
> >>      VBoxManage
> >>      setextradata, etc. but none of these works.
> >>      
> >>      It is possible to increase the resolution a little, but this setting
> >>      does not persist, and is never in line with the actual
> >>      resolution. In
> >>      the Win10 machine, the cursor is also widely misaligned, making it
> >>      difficult to even change screen definitions etc.
> >>      
> >>      Any thoughts?
> >>      
> >>      --
> >>      __________________________________
> >>      
> >>      Dr. Jonathan Pratschke
> >>      Research Fellow
> >>      Department of Economics and Statistics (DISES)
> >>      
> >>      University of Salerno
> >>      via Giovanni Paolo II, 132
> >>      Fisciano (SA) 84084, Italy
> >>      
> >>      email: [email protected] <mailto:[email protected]>
> >>      
> >>      Tel. 089 962284
> >>      Cell. 320 4640577
> >>      
> >>      
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