The same command on utopic:
$ ip link add tap14e33126-b6 type veth peer name qg-14e33126-b6 netns qrouter-0fb14595-c1ea-4c14-84d7-a05c88afcb08 Error: argument "tap14e33126-b6" is wrong: Unknown device
The same command on utopic:
$ ip link add tap14e33126-b6 type veth peer name qg-14e33126-b6 netns qrouter- 0fb14595- c1ea-4c14- 84d7-a05c88afcb 08
Error: argument "tap14e33126-b6" is wrong: Unknown device