kaxing

A sum-up from: Can't access loop device: "mount failed: Unknown error -1" or "failed to setup loop device: Operation not permitted" · Issue #2980 · lxc/lxd

Versions that works:

• lxd: 2.18-0ubuntu6
• lxc --version: 2.18
• host distro: Ubuntu 17.10 (Artful) with Kernel 4.13.0-19-generic
• container distro: Ubuntu 16.04.3

Steps: