>"I kept the guests at 5.2.4"

To clarify, using a host with 5.2.6, if you use the Oracle guest
additions from version 5.2.4 this problem is not reproducible in Ubuntu

>" I filed a bug report with Oracle"

Did you file a bug report with Oracle regarding the scope of this
report? If so, could you please provide the URL?

>"Today I also tried the 'beta' version of 5.2.7 with Ubuntu 18.04"

To clarify, you have 5.2.7 on a Ubuntu 18.04 host, and then install the
5.2.7 guest additions in Ubuntu GNOME 18.04?

>"That package had not been installed, but after installing that package"

To advise, you wouldn't have both the Oracle Guest Additions installed
and then install this package. If you did this, that will cause this
issue. virtualbox-guest-x11 is the guest additions that is made for

You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.

  Xorg freeze

Status in xorg package in Ubuntu:

Bug description:
  Host: Ubuntu 18.04, Virtualbox 5.2.6
  Guest: Ubuntu GNOME 17.10 and 18.04

  The problem is the guest's screen almost freezes completely as soon as
  I maximise any window in the guest. Any mouse click takes 10-60
  seconds before the system reacts to it.

  Windows 7 and 10 work without any problem.

  WORKAROUND: Disable 3D acceleration.

  WORKAROUND: Use as a guest Ubuntu Mate or Xubuntu.

  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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