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I'm trying to create a sandbox for testing an untrusted software. I'm using Debian, I have installed aufs-tools.

When I try to mount a minimal example with the following command:

mount -t aufs -o dirs=./write=rw:/=ro none ./mount

I'm getting:

mount: wrong fs type, bad option, bad superblock on none,
       missing codepage or helper program, or other error
       (for several filesystems (e.g. nfs, cifs) you might
       need a /sbin/mount.<type> helper program)
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

Using br: instead of dirs= gives the same.

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