Comment 16 for bug 1698443

It is running 16.04 LTS. I did a fresh MAAS deploy and ran ifdown again

ubuntu@server01:/etc/network$ sudo ifdown enp2s0f0.11
Removed VLAN -:enp2s0f0.11:-
Cannot find device "enp2s0f0.11"

After the ifdown command the interface is dropped even though it shows that it cannot find the interface. ifup brings it back up but with errors.

ubuntu@server01:/etc/network$ sudo ifup enp2s0f0.11
/etc/network/if-pre-up.d/mtuipv6: line 9: /sys/class/net/enp2s0f0.11/mtu: No such file or directory
/etc/network/if-pre-up.d/mtuipv6: line 10: /proc/sys/net/ipv6/conf/enp2s0f0.11/mtu: No such file or directory
Set name-type for VLAN subsystem. Should be visible in /proc/net/vlan/config
ifup: recursion detected for interface enp2s0f0 in parent-lock phase
Added VLAN with VID == 11 to IF -:enp2s0f0:-
Waiting for DAD... Done

Sorry this may be a MAAS problem. I will redeploy without IPv6 and see if I get the same errors.