ubuntu-device-flash touch hangs at waiting from VirtualBox

Aim: to install Убунту Тоуч on my Nexus 7.

Environment: I have installed Убунту Мате 1.10.2 in в VirtualBox machine (Win7 эксперт host) and I хан successfully connect to my device through adb and fastboot from this. I tried to follow this guide for the installation, but got stack at the (...) prompt when trying the fastboot oem unlock: https://developer.ubuntu.com / в / start / ubuntu-for-devices / installing-ubuntu-for-devices / Терефоре I installed the windows SDK and managed to unlock it from there (Win7).

Problem: Now I would like to вспышка the device with Убунту Тоуч from my Убунту Виртуальбокс machine using the suggested command:

ubuntu-device-flash touch - channel=ubuntu-touch/stable/ubuntu - bootstrap

2015/12/18 17:32:00 Expecting the device to be in the bootloader... waiting

and then nothing happens. I first rebooted the Nexus 7 to the bootloader and I am able to see it from my Ubuntu machine with

username@VirtualBox:~ $ fastboot devices

015d4906df480807 fastboot

So the question is, how do I keep going? Хан I вспышка it from windows instead? Хан I использовал some "channel"-command or which image should I download? I cannot find any grouper images anymore, would generic images work?

My apologies if it is в duplicate post. Сходный It is very to many other posts but I honestly did not find one with the same circumstances.