Comment 6 for bug 1691025

I just ran into this with 18.04.2, which has HWE out of the box.

Repro:

1) Fresh 18.04.2 in a KVM VM.
2) sudo apt install xpra
3) After graphical console login (?), input devices don't work.

Package list below:

---
$ sudo apt install xpra
[sudo] password for user:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  freeglut3 libgtkglext1 libpango1.0-0 libpangox-1.0-0 libpython-stdlib python
  python-cairo python-dbus python-gi python-gi-cairo python-gobject-2
  python-gtk2 python-gtkglext1 python-lz4 python-lzo python-minimal
  python-olefile python-opengl python-pil python-rencode python2.7
  python2.7-minimal ssh-askpass xserver-xorg-core xserver-xorg-input-void
  xserver-xorg-video-dummy
Suggested packages:
  python-doc python-tk python-dbus-dbg python-dbus-doc python-gobject-2-dbg
  python-gtk2-doc python-numpy libgle3 python-pil-doc python-pil-dbg
  python2.7-doc binfmt-support openssh-server python-pyopencl python-gst-1.0
  python-avahi python-netifaces cups-pdf python-cups python-opencv
  v4l2loopback-dkms python-yaml xfonts-100dpi | xfonts-75dpi
The following packages will be REMOVED:
  ubuntu-desktop xorg xserver-xorg-core-hwe-18.04 xserver-xorg-hwe-18.04
  xserver-xorg-input-all-hwe-18.04 xserver-xorg-input-libinput-hwe-18.04
  xserver-xorg-input-wacom-hwe-18.04 xserver-xorg-video-all-hwe-18.04
  xserver-xorg-video-amdgpu-hwe-18.04 xserver-xorg-video-ati-hwe-18.04
  xserver-xorg-video-fbdev-hwe-18.04 xserver-xorg-video-intel-hwe-18.04
  xserver-xorg-video-nouveau-hwe-18.04 xserver-xorg-video-qxl-hwe-18.04
  xserver-xorg-video-radeon-hwe-18.04 xserver-xorg-video-vesa-hwe-18.04
  xserver-xorg-video-vmware-hwe-18.04
The following NEW packages will be installed:
  freeglut3 libgtkglext1 libpango1.0-0 libpangox-1.0-0 libpython-stdlib python
  python-cairo python-dbus python-gi python-gi-cairo python-gobject-2
  python-gtk2 python-gtkglext1 python-lz4 python-lzo python-minimal
  python-olefile python-opengl python-pil python-rencode python2.7
  python2.7-minimal ssh-askpass xpra xserver-xorg-core xserver-xorg-input-void
  xserver-xorg-video-dummy
0 upgraded, 27 newly installed, 17 to remove and 0 not upgraded.
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