This will make networking's output go to the console as well: sudo mkdir -p /etc/systemd/system/networking.service.d printf '[Service]\nStandardOutput=journal+console\nStandardError=journal+console\n' | sudo tee /etc/systemd/system/networking.service.d/debug.conf
(I. e. do this before you set up the box to hang on networking). After a reboot, you should then be able to see what's going on in "nova console- log". -- 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/1569064 Title: ifupdown wants to configure interfaces it shouldn't (lxdbr0) Status in ifupdown package in Ubuntu: Confirmed Status in lxd package in Ubuntu: Confirmed Bug description: The reproducer: create a xenial vm. There, run lxc launch ubuntu: leave that container running, and reboot. If you're "lucky", networking will never come up: [[0;32m OK [0m] Found device /sys/subsystem/net/devices/lxdbr0. [[0m[0;31m* [0m] A start job is running for Raise network interfaces (32s / 5min 11s)[K[[0;1;31m*[0m[0;31m* [0m] A start job is running for Raise network interfaces (33s / 5min 11s)[K[[0;31m*[0;1;31m*[0m[0;31m* [0m] A start job i s running for Raise network interfaces (34s / 5min 11s)[K[ [0;31m*[0;1;31m*[0m[0;31m* [0m] A start job is running for Raise network interfaces (34s / 5min 11s)[K[ [0;31m*[0;1;31m*[0m[0;31m* [0m] A start job is running for Raise network interfaces (35s / 5min 11s)[K[ [0;31m*[0;1;31m*[0m[0;31m*[0m] A start job is running for Raise network interfaces (35 s / 5min 11s)[K[ [0;31m*[0;1;31m*[0m] A start job is running for Raise network interfaces (36s / 5min 11s)[K[ [0 ;31m*[0m] A start job is running for Raise network interfaces (37s / 5min 11s)[K[ [0;31m*[0;1;31m*[0m] A start job i (etc) I can reproduce this 100% on serverstack (openstack) instances. I cannot reproduce it locally with uvt-kvm. What appears to be happening is that lxd starts lxd-bridge which creates lxdbr0 with no ipv4 address; this racily happens before systemd does its networking setup; said network setup then sees lxdbr0 and wants to configure it, so waits for it to have an ip address. Plausible? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1569064/+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