For me the problem is kind of important, since I moved all my work to 
specialised Virtual Machines; 
a. one for the normal office and web browsing work, 
b. one for banking and other financial apps, 
c. one to try out new and unknown apps,
d. one to try out Ubuntu 18.04.

The work around I use now, is: 
a. Peppermint 8 with 3D acceleration;  
b. For banking I can live with software rendering and Ubuntu 17.10;
c. Xubuntu 17.10 with 3D acceleration.

I would politely propose to increase the priority of the bug, since I
expect, it will be relatively simple to solve. Besides a desktop that
freezes, if you maximise a window, looks a little bit like the past of
e.g. Ubuntu 6.06 :)

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1748729

Title:
  Xorg freeze

Status in xorg package in Ubuntu:
  New

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)
  Lsusb:
   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)
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: 
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.family: Virtual Machine
  dmi.product.name: 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 
2:2.99.917+git20171229-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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