Freezes when trying to configure vboxnet0

If I select the vboxnet0 (the server is not running, so status is failed) and then press Advanced Settings, it just freezes.
Doing a top shows that it starts using 100% CPU

Launchpad Details: [#LP1593158](https://bugs.launchpad.net/bugs/1593158) jegjessing - 2016-06-16 09:48:17 +0000

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