It's OK, I can help here too

Well, I could, if I knew what was wrong...

The fact you're getting "mount failure" as an error suggests to me you're using my newest version of easy-chroot, the one I uploaded last night.*

Welcome to the "beta tester" fold!

Can you tell me: what does the error say AFTER the path to your external card? It should say something like, "failed to mount on ..." What does it fail to mount on?

*I'm trying to make the error-checking more rigorous and the error messages more meaningful. This problem should help me with the "more meaningful" part, I'd say...