Installation docs should mention encrypted android device workaround

[Barry Warsaw]

If you've encrypted your android device, there's one more step you must perform before you can install Ubuntu on it. You must perform a factory reset via the android system settings. Otherwise, even if you use `ubuntu-device-flash ... --bootstrap` you'll still end up with android on your device (despite the fact that when your device reboots, you'll get the spinny Ubuntu logo). A factory reset is the only way to "undo" device encryption. This might be a useful URL to link to:

http://www.howtogeek.com/141953/how-to-encrypt-your-android-phone-and-why-you-might-want-to/

I suggest adding this as a small section under "Unlocking the Android device". Note that as with other advice here, the user may want to back up their android data before factory resetting.

Reported from: http://developer.ubuntu.com/start/ubuntu-for-devices/installing-ubuntu-for-devices/

[Daniel Holbach (dholbach)]

Is this something ubuntu-device-flash could find out and work around or notify the user about?

[Barry Warsaw (barry)]

On Jul 24, 2014, at 10:36 AM, Daniel Holbach wrote:

>Is this something ubuntu-device-flash could find out and work around or
>notify the user about?

I'm not sure. FWIW, u-d-f worked fine and the effects were only noticed after
the reboot was complete.

[Nicholas Skaggs (nskaggs)]

I updated the text under 'install ubuntu' noting a factory reset must be performed when coming from an encrypted phone.