Steps:
- Took a fresh 17.10 system as KVM Host
- Install virt-manager for UI driven guests
- fetch 17.10 desktop iso to install from [1]
- change resolution - ok
=> I must admit that with wayland in the guest I always had slight issues like 
shaky mouse pointer tracking, but so far it didn't break
- reboot - this hang on reboot in the splash screen
I knew there were various issues upstream with qxl/spice + wayland.
So I changed to graphic virtio in virt-manager.
That made it boot again.
---
- install spice-vdagent in guest to trigger the bug
- change resolution - ok
- reboot - ok 
---

Maybe you are affected by another kind of qxl/spice+wayland bug - and
while I can't reproduce I wanted to ask if you could check if changing
the video mode makes this work better for you?

If so it seems that the upstreams of all the related projects need some
more time to clear out more corner cases - I found nothing I could
easily do to fix it other than avoiding.

[1]: http://releases.ubuntu.com/17.10/ubuntu-17.10-desktop-amd64.iso

** Changed in: qemu (Ubuntu)
       Status: New => Incomplete

** Changed in: spice-vdagent (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1734253

Title:
  login  in 17.10 as guest in KVM/Qemu fails and ends on a blank purple
  screen

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