This bug was fixed in the package vlan - 1.9-3ubuntu10.4
--------------- vlan (1.9-3ubuntu10.4) trusty; urgency=medium
* Don't trust ifup return code, as it returns 0 on failure; call ip link set up after ifup to force vlan raw device up. (LP: #1573272)
-- Dan Streetman <email address hidden> Mon, 05 Jun 2017 12:12:01 -0400
This bug was fixed in the package vlan - 1.9-3ubuntu10.4
---------------
vlan (1.9-3ubuntu10.4) trusty; urgency=medium
* Don't trust ifup return code, as it returns 0 on failure; call ip link
set up after ifup to force vlan raw device up. (LP: #1573272)
-- Dan Streetman <email address hidden> Mon, 05 Jun 2017 12:12:01 -0400