bcad AppImage fails on Ubuntu xenial

[probonopd]

Describe the bug
bcad AppImage fails on Ubuntu xenial

To Reproduce
Steps to reproduce the behavior:

1. Run Ubuntu xenial
2. Run the AppImage

Expected behavior
Runs

Screenshots

Environment (please complete the following information):

• Ubuntu
• xenial

Additional context
Reference:
AppImage/appimage.github.io#2152

[probonopd]

Apparently some required libraries such as libffi.so.7 are not bundled correctly in the AppImage,