Comment 8 for bug 1633609

Thanks to the answer on askbuntu.com I improved the workaround.

In /etc/default/spice-vdagentd

put the following line

SPICE_VDAGENTD_EXTRA_ARGS=-X

then run

service spice-vdagent restart

This disables systemd-logind integration.

It is actually described in 'man spice-vdagentd'.

http://askubuntu.com/questions/880074/configuration-for-spice-vdagentd/884950#884950