Comment 87 for bug 1301015

Andy Courcier (andycuk) wrote :

Ubuntu 14.04 Server Not Rebooting (ifupdown network issue)

It appears that with the latest bundle of Ubuntu updates, ifupdown breaks the server boot quite fantastically.

Resolution 1: Change the order that the updates are applied in

[1] BACKUP SERVER!
[2] apt-get update
[3] apt-mark hold ifupdown
[4] apt-get upgrade -y
[5] apt-mark unhold ifupdown
[6] apt-get upgrade -y
[7] Check that the server reboots correctly

Resolution 2: edit your network interfaces file, specifically looking for incorrect commands:
example: post-up ip6tables-restore < /etc/iptables.up.rules

This is clearly not correct since it is attempting to load IPV4 tables to IPV6 routes and will result in a network failure,
thus preventing booting of the server.

[1] nano /etc/network/interfaces
[2] Remove incorrect post boot commands, ie. post-up ip6tables-restore < /etc/iptables.up.rules
[3] apt-mark unhold ifupdown (If you previously had the package on hold)
[4] apt-get upgrade -y
[5] Check that the server reboots correctly.

I am not sure where this bug came from @ubuntu but it is nasty, nasty, nasty!