I need to mount a binary file that contains a filesystem so I can copy
files onto it.

I could already do this using /dev/loop but I need to automate this
without requiring root privileges for a build system.

To solve this problem, the guestmount folks pulled together TONS of
code.  They are creating a custom minimized kernel, emulating it with
QEMU, booting it with the binary file attached, attaching FUSE to the
mount point and connecting to it at the application layer.  All to avoid
needing /dev/loop and root access.

Guestmount used to work out of the box.  And you just broke it "by-
design" with a change that provides zero security or protection from
anyone with a brain or an internet connection.  I agree with Rich W. M.
Jones.  You are making ubuntu less useful.

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https://bugs.launchpad.net/bugs/759725

Title:
  The kernel is no longer readable by non-root users

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