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
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Desktop Bugs, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1988488
Title:
Screen freeze before the login screen on VirtualBox (if the third
party software option was selected)
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