I had/have sort of the same problem, when running the network startup it somehow wants to set up my vlans twice; i think when i do the 'master' interface, and once when it sets up the normal interface.
The first time it just sets up the vlan and assigns an address. The second time it tries to add that address again, but that obviously fails with an 'RTNETLINK answers: File exists' And because the default (since 2014?) is to treat any error as fatal it just stops configuring the interface even tho it would be perfectly ok to at least try to set, for example, the default route or the 'up' statements. But no, a small step failed so it's better to leave the interface half configured. On Ubuntu 16.04 this can be worked around by adding "EXCLUDE_INTERFACES=' --ignore-errors' " to /etc/default/networking so ifupdown does the sensible thing and tries to continue after an error instead of leaving a half configured interface. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ifupdown in Ubuntu. https://bugs.launchpad.net/bugs/1565804 Title: ifup of vlan interfaces failing during networking start - RTNETLINK answers: File exists Status in ifupdown package in Ubuntu: Confirmed Bug description: /e/n/i: auto lo iface lo inet loopback dns-nameservers 10.245.168.2 dns-search dellstack auto eth0 iface eth0 inet static gateway 10.245.168.1 address 10.245.168.17/21 dns-nameservers 10.245.168.2 mtu 1500 auto eth1 iface eth1 inet manual mtu 1500 auto eth1.2667 iface eth1.2667 inet static address 10.245.184.20/24 vlan-raw-device eth1 mtu 9000 vlan_id 2667 output from networking startup: ● networking.service - Raise network interfaces Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled) Drop-In: /run/systemd/generator/networking.service.d └─50-insserv.conf-$network.conf Active: failed (Result: exit-code) since Mon 2016-04-04 12:14:26 UTC; 1h 33min ago Docs: man:interfaces(5) Process: 1255 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE) Process: 868 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo)" ] && udevadm settle (code=exited, Main PID: 1255 (code=exited, status=1/FAILURE) Apr 04 12:14:25 reflecting-attraction systemd[1]: Starting Raise network interfaces... Apr 04 12:14:26 reflecting-attraction ifup[1255]: Set name-type for VLAN subsystem. Should be visible in /proc/net/vlan/config Apr 04 12:14:26 reflecting-attraction ifup[1255]: RTNETLINK answers: File exists Apr 04 12:14:26 reflecting-attraction ifup[1255]: Failed to bring up eth1.2667. Apr 04 12:14:26 reflecting-attraction systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE Apr 04 12:14:26 reflecting-attraction systemd[1]: Failed to start Raise network interfaces. Apr 04 12:14:26 reflecting-attraction systemd[1]: networking.service: Unit entered failed state. Apr 04 12:14:26 reflecting-attraction systemd[1]: networking.service: Failed with result 'exit-code'. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: ifupdown 0.8.10ubuntu1 ProcVersionSignature: User Name 4.4.0-16.32-generic 4.4.6 Uname: Linux 4.4.0-16-generic x86_64 ApportVersion: 2.20.1-0ubuntu1 Architecture: amd64 Date: Mon Apr 4 13:42:48 2016 SourcePackage: ifupdown UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1565804/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
