I was able to reproduce this in lxc:
$ sudo apt-get install libvirt-clients gir1.2-libvirt-glib-1.0 libvirt-
daemon-driver-qemu libvirt-daemon-driver-storage-rbd libvirt-daemon-
system libvirt-daemon-system-systemd libvirt-glib-1.0-0 libvirt0
python3-libvirt
triage-focal+20.04:~$ virsh domcapabilities
error: failed to get emulator capabilities
error: invalid argument: unable to find any emulator to serve 'x86_64'
architecture
And after running `virsh capabilities` and then again `virsh
domcapabilities` it shows valid looking output.
** Changed in: libvirt (Ubuntu)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1867460
Title:
[Focal] 'virsh domcapabilities' fails unless 'virsh capabilites' is
run first
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