File drag-n-drop, automatic resolution changing, and shared clipboard are all broken on Kubuntu 22.10

[Aaron Rainbolt]

Note that, in my experience, this bug *only* affect Kubuntu 22.10 and Ubuntu Studio 22.10, however Ubuntu Studio specifically does not support VMs, and I assume that fixing the problem in Kubuntu will fix the problem in Ubuntu Studio too.

Steps to reproduce:

1. Install GNOME Boxes on an Ubuntu machine.
2. Install Kubuntu 22.10 into a GNOME Boxes virtual machine.
3. Maximize the GNOME Boxes window.
4. Boot the newly installed system.

Expected result: The VM resolution should change itself to fit the window perfectly.

Actual result: The VM resolution remains at some default resolution (1024x768?).

Additional details: Shared clipboard also does not work (the clipboard of the host and the guest remain separate), and file drag-n-drop from host to guest does not work (no files are transferred into the guest). All of these features work out of the box on all flavors of Ubuntu 22.04 (Kubuntu and Ubuntu Studio included), and on all flavors of Ubuntu 22.10 except for Kubuntu and Ubuntu Studio.

Also, I do not remember having tested file drag-n-drop or shared clipboard on Ubuntu Studio, but I have tested both on Kubuntu.

I believe this is the result of spice-vdagent either failing to start, dying shortly after starting, or glitching and remaining active but not actually doing anything its supposed to. If I stop all services related to spice-vdagent (spice-vdagentd.socket, spice-vdagentd, and spice vdagent, note the "d" at the end of the first two), ensure that all spice-vdagent and spice-vdagentd processes are terminated by using killall, and then run "sudo spice-vdagentd -x" in a terminal, then I am able to set the VM screen resolution to match the window perfectly. Shared clipboard and file drag-n-drop still don't work, though.

ProblemType: Bug
DistroRelease: Ubuntu 22.10
Package: spice-vdagent 0.22.1-3
ProcVersionSignature: Ubuntu 5.19.0-29.30-generic 5.19.17
Uname: Linux 5.19.0-29-generic x86_64
ApportVersion: 2.23.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Sun Jan 22 17:46:18 2023
InstallationDate: Installed on 2023-01-22 (0 days ago)
InstallationMedia: Kubuntu 22.10 "Kinetic Kudu" - Release amd64 (20221020)
SourcePackage: spice-vdagent
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Bonzai11 (dacryo)]

Experienced the same issue after upgrading a Kubuntu 22.04 virtual machine to 22.10.
Manually kicking off `spice-vdagent` works as expected and functions as expected.