@killerbee you're welcome

Worked kind of. Its important that you first create a folder in the user-data/xenial folder I named it SDCARD and then the mount command is: sudo mount -B /media/phablet/ED34-76D7/ ~/.local/share/libertine-container/user-data/xenial/SDCARD Now i can access the data from libertine apps

Well from that link @UniSuperBox shared it looks like the Ubuntu/Mozilla devs for ARMHF hardware are at last aware of the issue and working on it for those architectures.