Installing on existing raspbian

[michel8166]

you could try berry boot, maybe it will help you.

[GUIDE] Multiboot Volumio2 (with Kodi & al.) under Berryboot

Tired of swapping SDs containing different distributions? We’ve got a solution for you! This guide provides a very easy (1-liner command) Volumio2 install process within Berryboot: you will then enjoy all great Volumio2 features (including OTA updates, etc…) + extra benefits explained below. Background: why “berrybooting”? Several fellow Volumio users have been asking a few times about how to run Volumio2 together with some other distribution(s) (Kodi, RetroArch, etc) independently on same …