I think the problem is gnome-shell waiting for this command (which never
finishes):

/usr/lib/x86_64-linux-gnu/gstreamer1.0/gstreamer-1.0/gst-plugin-scanner
-l /usr/bin/gnome-shell

because it's waiting for an X server (which does exist as Xwayland):

#0  0x00007f76ea710ec4 in __GI___poll (fds=0x7ffed6d30280, nfds=1, timeout=-1) 
at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f76e9c78e23 in ?? () from /lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f76e9c7c522 in xcb_connect_to_fd () from 
/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f76e9c7cedc in xcb_connect_to_display_with_auth_info () from 
/lib/x86_64-linux-gnu/libxcb.so.1
#4  0x00007f76e9e57eea in _XConnectXCB () from /lib/x86_64-linux-gnu/libX11.so.6
#5  0x00007f76e9e47d17 in XOpenDisplay () from /lib/x86_64-linux-gnu/libX11.so.6
#6  0x00007f76ea37c537 in ?? () from 
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#7  0x00007f76ea353d28 in ?? () from 
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#8  0x00007f76ea3181f7 in ?? () from 
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#9  0x00007f76eaae85c5 in ?? () from /lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#10 0x00007f76eaaef84d in ?? () from /lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#11 0x00007f76eaaf08f4 in ?? () from /lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#12 0x00007f76eaaf19b8 in _gst_plugin_loader_client_run () from 
/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#13 0x000055c6eaeb61dc in ?? ()
#14 0x00007f76ea623510 in __libc_start_call_main 
(main=main@entry=0x55c6eaeb6120, argc=argc@entry=3, 
    argv=argv@entry=0x7ffed6d30c98) at ../sysdeps/nptl/libc_start_call_main.h:58
#15 0x00007f76ea6235c9 in __libc_start_main_impl (main=0x55c6eaeb6120, argc=3, 
argv=0x7ffed6d30c98, init=<optimised out>, 
    fini=<optimised out>, rtld_fini=<optimised out>, stack_end=0x7ffed6d30c88) 
at ../csu/libc-start.c:381
#16 0x000055c6eaeb6235 in _start ()


** Also affects: gstreamer1.0 (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: gstreamer1.0 (Ubuntu)

** Also affects: libx11 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: libx11 (Ubuntu)
       Status: New => Confirmed

** Changed in: libx11 (Ubuntu)
   Importance: Undecided => High

** Also affects: libxcb (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: libxcb (Ubuntu)
       Status: New => Confirmed

** Changed in: libxcb (Ubuntu)
   Importance: Undecided => High

-- 
You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1988488

Title:
  Screen freeze before the login screen on VirtualBox (if the third
  party software option was selected)

Status in gnome-shell package in Ubuntu:
  Confirmed
Status in gstreamer-vaapi package in Ubuntu:
  Confirmed
Status in libx11 package in Ubuntu:
  Confirmed
Status in libxcb package in Ubuntu:
  Confirmed

Bug description:
  The problem started to appear 2 weeks ago after one of my daily
  updates. It also happens after I re-install the system from a freshly
  downloaded ISO file. The system freezes at the moment, it starts the
  gnome display manager.

  I file the bug-report after a partial upgrade just before I will
  reboot the system. If needed I can reboot in recovery mode, since the
  gnome display manager is not started in that case.

  I tried the continue button without effect and also "apt upgrade" and
  "apt dist-upgrade" do have the same effect

  I run the VM from the Host-OpenZFS file system, so I can restore to
  before the update. Recently I use a Virtualbox snapshot to restore the
  system to before the update/upgrade.

  If you need log files, let me know.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.10
  Package: systemd 251.4-1ubuntu1
  ProcVersionSignature: Ubuntu 5.15.0-27.28-generic 5.15.30
  Uname: Linux 5.15.0-27-generic x86_64
  ApportVersion: 2.23.0-0ubuntu1
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Sep  1 19:42:04 2022
  InstallationDate: Installed on 2022-05-28 (96 days ago)
  InstallationMedia: Ubuntu 22.10 "Kinetic Kudu" - Alpha amd64 (20220526)
  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
  Lsusb-t:
   /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
   /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/8p, 480M
       |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
  MachineType: innotek GmbH VirtualBox
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-27-generic 
root=UUID=9eaf84b0-b69b-4760-80b5-310e3a258bda ro quiet splash
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: systemd
  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:sku:
  dmi.product.family: Virtual Machine
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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