When leapp fails to mount the target userspace overlay fs, it provides just a simple error message like the one below with no further details. That makes any kind of further debugging difficult.

MountError: Failed to create mount target directory /var/lib/leapp/scratch/mounts/root_/system_overlay/var/log/audit 

Acceptance criteria:

• leapp collects information relevant to the mounting failure and prints it in the error message

Related: https://access.redhat.com/solutions/7020579