This bug was fixed in the package vlan - 1.9-3.2ubuntu6
--------------- vlan (1.9-3.2ubuntu6) bionic; urgency=medium
* Revert change for lp1573272; instead fix by redesigning when vlan interfaces are created; after raw-device ifup, not during raw-device udev processing. (LP: #1701023)
-- Dan Streetman <email address hidden> Thu, 19 Apr 2018 18:10:17 -0400
This bug was fixed in the package vlan - 1.9-3.2ubuntu6
---------------
vlan (1.9-3.2ubuntu6) bionic; urgency=medium
* Revert change for lp1573272; instead fix by redesigning when vlan
interfaces are created; after raw-device ifup, not during raw-device
udev processing. (LP: #1701023)
-- Dan Streetman <email address hidden> Thu, 19 Apr 2018 18:10:17 -0400