container does not receive IP address after 15.04 upgrade

Perhaps this is an upgrade issue, perhaps it is a installation issue.

In either case, there should be more information about upgrading lxc.

After upgrading to Ubuntu 15.04, my container no longer started.

After upgrading, I had to remove the following line from the config file for my container:

lxc.network.link = lxcbr0

Here is the attempt at starting before commenting out the line:

kevin@nereocystis:~$ sudo lxc-start -F -n escale_build
lxc-start: conf.c: instantiate_veth: 2660 failed to attach 'vethTCPSQO' to the bridge 'lxcbr0': Operation not permitted
lxc-start: conf.c: lxc_create_network: 2943 failed to create netdev
lxc-start: start.c: lxc_spawn: 914 failed to create the network
lxc-start: start.c: __lxc_start: 1164 failed to spawn 'escale_build'
lxc-start: lxc_start.c: main: 344 The container failed to start.
lxc-start: lxc_start.c: main: 348 Additional information can be obtained by setting the --logfile and --logpriority options.

After commenting out this line, the container starts, but no IP address is assigned in the container.

But no IP address was assigned:

For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/eth0/9a:9b:92:81:87:62
Sending on LPF/eth0/9a:9b:92:81:87:62
Sending on Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 10
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 13
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 10
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 14
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
done.

Eventually, I purged lxc, and reinstalled it, with the same results.

I also tried creating a new container from scratch using the instructions in:

https://help.ubuntu.com/lts/serverguide/lxc.html#lxc-network

sudo lxc-create --template download --name u1

Again, no IP address.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: lxc 1.1.2-0ubuntu3
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun May 3 10:44:23 2015
InstallationDate: Installed on 2013-06-02 (699 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
KernLog:
 [56541.698842] audit: type=1400 audit(1430671655.848:49): apparmor="DENIED" operation="mount" info="failed flags match" error=-13 profile="lxc-container-default" name="/" pid=3109 comm="mount" flags="ro, remount, relatime"
 [56620.060697] audit: type=1400 audit(1430671734.154:50): apparmor="DENIED" operation="mount" info="failed type match" error=-13 profile="lxc-container-default" name="/sys/fs/cgroup/" pid=3403 comm="systemd" flags="ro, nosuid, nodev, noexec, remount, strictatime"
SourcePackage: lxc
UpgradeStatus: No upgrade log present (probably fresh install)
defaults.conf:
 lxc.network.type = veth
 lxc.network.link = lxcbr0
 lxc.network.flags = up
 lxc.network.hwaddr = 00:16:3e:xx:xx:xx