Guenther, did you have AppArmor denials in your kern.log?
Can people try adding this to /etc/apparmor.d/abstractions/libvirt-qemu:
owner /dev/ttyS* rw,
If that doesn't work, can you try:
/dev/ttyS* rw,
** Changed in: libvirt (Ubuntu)
Status: Confirmed => Incomplete
** Changed in: libvirt (Ubuntu)
Assignee: (unassigned) => Jamie Strandboge (jdstrand)
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map serial port throws "chardev: opening backend "tty" failed"
https://bugs.launchpad.net/bugs/578527
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