Cannot boot KVM after update to Debian 10

Hello all,

I just did a distribution upgrade on my system to Debian 10. The upgrade went fine and all seems well but I can’t start my KVM. I start it up in cloudmin and after a couple seconds cloudmin reports that the KVM started fine but the system is unpingable, SSHable and cloudmin reports it as down. When I go into the boot messages, it says:

qemu-system-x86_64: -usbdevice tablet: ‘-usbdevice’ is deprecated, please use ‘-
device usb-…’ instead
qemu-system-x86_64: -monitor tcp:,server: info: QEMU waiting for
connection on: disconnected:tcp:,server
qemu-system-x86_64: Invalid parameter ‘vlan’

It is possible that this issue was happening before the upgrade to Debian 10 as I haven’t tried starting this KVM for a bit. The KVM is using Debian 9. Any help is greatly appreciated.

Thank you,


I’m getting the exact same errors on a fresh Debian 10 install. Apparently the “vlan” parameter to -net was deprecated in QEMU 2.9.0 and removed in a subsequent release.

Removing the VLAN0 tag in the config file clears the error but cloudmin puts it back in when cloning or creating new machines.

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