Comment 1 for bug 1436427

This sounds similar to bug #1410113, which is a more generic bug. I'm not going to mark this a duplicate however as it has a reproducible scenario.

Also confirmed this bug for RTM, as I reproduced it on the third try. I verified that there was a mobile data connection and that it worked ( ie. I could ping ubuntu.com ), activated a WiFi connection, verified the routing table, and then disabled WiFi. On the third cycle, I ended up with an empty routing table:

phablet@ubuntu-phablet:~$ netstat -run
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface

...that said, at some point, it looks like the system did recover at some later point, as it appears to have magically healed itself, and I know have a valid routing table, and usable mobile data connection.

I will continue to work on reproducing, and will add logs, and other data if/when I can do so again.

phablet@ubuntu-phablet:~$ system-image-cli -i
current build number: 20
device name: krillin
channel: ubuntu-touch/ubuntu-rtm/14.09
last update: 2015-03-26 15:44:56
version version: 20
version ubuntu: 20150312
version device: 20150310-3201c0a
version custom: 20150216-561-29-186