How to teach android inside virtualbox to use proxy inside virtual internal network?

Question

Android

If you upload a video to youtube from me a big box of cookies (or whatever you prefer). absolutely serious :)
Virtualbox
Guests:
N1 ubuntu
here adapter1 is nat and adapter2 is internal network.
The proxy server is running.
For example, listens on 192.168.10.10:8345. – ok.
N2 Android 4.4 x86
adapter1 internal network.
It is necessary to explain to the android to access the Internet through a proxy.
Preferably through the terminal. it is possible through proxydroid.
Android eth0 192.168.10.11 - ok
From android ping 192.168.10.10 - ok
Installed proxydroid (Marshmallow and Lollipop doesn't work for strange reasons).
Registered a proxy - no
Tried different dns - no
Sqlite and terminal are making me depressed :)