BertN45, given 3D acceleration is a WORKAROUND, Low is in line with its
definition noted in . To advise,
the potential difficulty in solving a bug has no impact on Importance.

Despite this:

1) What version of VirtualBox are you using on the host?

2) Did this issue start happening in the guest after an update from
either the guest, or host? If so, which specifically?

3) In your last comment, it appears you are indicating that this only
happens in 17.10 GNOME, but not with 17.10 Xubuntu. Could you please

4) Does installing in the guest the package virtualbox-guest-x11 and
rebooting improve the situation?

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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  Xorg freeze

Status in xorg package in Ubuntu:

Bug description:
  I run Ubuntu 18.04 in Virtualbox 5.2.6 with as host OS; Ubuntu 17.10 with the 
propriety Nvidia driver 340 as suggested by Ubuntu.
  The screen almost freezes completely as soon as I maximise any window in the 
guest OS Ubuntu 18.04. Any mouse click takes 10-60 seconds before the system 
reacts to it. It took a long time to generate this bug-report.

  I had the same problem with Ubuntu 17.10, while Guest OSes Ubuntu Mate
  17.10, Xubuntu 17.10, and Peppermint 8. Windows 7 and 10 work without
  any problem.

  WORKAROUND: Disable 3D acceleration.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu4
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  ApportVersion: 2.20.8-0ubuntu8
  Architecture: amd64
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Feb 11 06:31:52 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Continuously
  GpuHangReproducibility: Yes, I can easily reproduce it
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter 
[80ee:beef] (prog-if 00 [VGA controller])
  InstallationDate: Installed on 2017-12-22 (50 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20171219)
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: innotek GmbH VirtualBox
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic 
root=UUID=f3311827-9a0c-490d-a707-d4d037152c4d ro quiet splash
  Renderer: Software
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install) 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr: Virtual Machine VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.89-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.3.3-0ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.3.3-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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