Failure to start container “Failed to start device “eth0”: Error: Unknown device type.

[Magnus Rosenqvist]

I know probably wrong place. Tried understand where to send bug report but very confusing. Hopefully someone knows where to send it.

Raspberry pi 4B, Ubuntu 21.10,

~lxc launch ubuntu:20.04
~lxc start container
Error: Failed preparing container for start: Failed to start device “eth0”: Failed to create the veth interfaces veth34cbc1ee and veth84f13473: Failed to run: ip link add veth34cbc1ee type veth peer name veth84f13473: Error: Unknown device type.

Default profile with lxdbr0

lxc init with defaults.

Tried different containers with the same error. Error: Unknown device type

[Magnus Rosenqvist (ntaken)]

Got help over at https://github.com/lxc/lxc/issues/4012

Apparently for at least more than one year the Ubuntu image for raspberry pi do not include the necessary module. Despite that at least in their latest release including LXC/LXD by default.......

Error message: ~lxc start container

Error: Failed preparing container for start: Failed to start device “eth0”: Failed to create the veth interfaces veth34cbc1ee and veth84f13473: Failed to run: ip link add veth34cbc1ee type veth peer name veth84f13473: Error: Unknown device type.

On Ubuntu 21.10 I fixed it by running: sudo apt install linux-modules-extra-raspi

[Magnus Rosenqvist (ntaken)]

I hope still that this will be fixed. It does not look good when a by default installed feature do not work because a module is missing.

And the error message is really obtuse.

Hopefully someone can forward this bug report to whoever so it can do some good.