Hi all,
This post is to give a solution to a problem I’ve had, and many hours spend on fixing it. I googled the internet thin, and while I could find people with similar issues, I couldn’t find anyone with exactly my problem. This post is to help the next person searching a solution for this problem. 
My setup before things broke.
- OS: Ubuntu 20.04 LTS
- Zigbee Coordinator: Conbee II
- Running Home Assistant Operating System in a virtual machine on my Ubuntu. Using KVM / libvirt / virsh. Setup using this guide: Install Home Assistant OS with KVM on Ubuntu headless (CLI only)
Errors I was getting:
(I unfortunately don’t have the full error log anymore 
)
- ZHA giving the error “Failed to set up”
- asyncio.exceptions.CancelledError
- asyncio.exceptions.TimeoutError
- Couldn’t start deCONZ = dresden elektronik deCONZ protocol: ConBee I/II, RaspBee I/II coordinator
- ERROR (MainThread) [homeassistant.config_entries] Error setting up entry ConBee II for zha
- Error setting up entry ConBee II for zha
Symptoms:
- I could see that ZHA would simply fail to start on integrations page.
- I tried deleting ZHA integration, and then reboot. Home assistant would auto discover ZHA, and prompt setup. When I then attempted the setup, it would give me the error: “Failed to probe the usb device”
My virsh config: (virsh edit hassos)
<domain type='kvm'>
<name>hassos</name>
<uuid>1f91815b-f1b9-4c94-91ae-ae839ff9609d</uuid>
<memory unit='KiB'>1572864</memory>
<currentMemory unit='KiB'>1572864</currentMemory>
<vcpu placement='static'>3</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-bionic'>hvm</type>
<loader readonly='yes' type='pflash'>/usr/share/OVMF/OVMF_CODE.fd</loader>
<nvram>/var/lib/libvirt/qemu/nvram/hassos_VARS.fd</nvram>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
</features>
<cpu mode='host-model' check='partial'/>
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/bin/kvm-spice</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/var/lib/libvirt/images/hassos-vm/hassos.qcow2'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</disk>
<controller type='usb' index='0' model='ich9-ehci1'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x7'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x1'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
<master startport='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<interface type='bridge'>
<mac address='52:54:00:2e:45:91'/>
<source bridge='br0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</interface>
<serial type='pty'>
<target type='isa-serial' port='0'>
<model name='isa-serial'/>
</target>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<hostdev mode='subsystem' type='usb' managed='no'>
<source>
<vendor id='0x1cf1'/>
<product id='0x0030'/>
</source>
<address type='usb' bus='0' port='1'/>
</hostdev>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</memballoon>
</devices>
</domain>
Solution
First shut off home assistant.
virsh shutdown hassos
(Where hassos if your VM’s name)
Then:
virsh edit hassos
Turns out I had to remove the following from my virsh config:
<hostdev mode='subsystem' type='usb' managed='no'>
<source>
<vendor id='0x1cf1'/>
<product id='0x0030'/>
</source>
<address type='usb' bus='0' port='1'/>
</hostdev>
And instead paste this in its place:
<serial type='dev'>
<source path='/dev/serial/by-id/usb-dresden_elektronik_ingenieurtechnik_GmbH_ConBee_II_DE2419374-if00'/>
<target type='usb-serial' port='1'>
<model name='usb-serial'/>
</target>
<address type='usb' bus='0' port='4'/>
</serial>
I could find the source path by running:
ls -l /dev/serial/by-id/
Now, start hassos again.
virsh start hassos.
Then, SSH to your home assistant VM. I use the “SSH & Web Terminal” add-on.
Now check what the “source path” is called in home assistant, by running the following in home assistant VM terminal.
ls -l /dev/serial/by-id/
For me it was called:
usb-QEMU_QEMU_USB_SERIAL_1-0000:00:03.7-4-if00-port0
Now edit:
/root/config/.storage/core.config_entries
And update the ZHA configuration to this new source path.
Mine looks like this:
"entry_id": "0292a6eeceb2792928417059c5498c34",
"version": 3,
"domain": "zha",
"title": "ConBee II, s/n: DEXXXXX - dresden elektronik ingenieurtechnik GmbH",
"data": {
"radio_type": "deconz",
"device": {
"path": "/dev/serial/by-id/usb-QEMU_QEMU_USB_SERIAL_1-0000:00:03.7-4-if00-port0"
}
Now don’t restart, but shut off and on.
virsh shutdown hassos
virsh start hassos
That’s it, this fixed it for me!
Please let me know if this helped you, so I know whether or not making a post like this would be helpful in the future