Docker permission denied in LXD container

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Docker run errors in LXD container

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docker: Error response from daemon: failed to create shim: OCI runtime create failed: container_linux.go:380: starting container process caused: process_linux.go:545: container init caused: rootfs_linux.go:76: mounting "proc" to rootfs at "/proc" caused: mount through procfd: permission denied: unknown.
This is resulting from the security setting of LXD container.

Solution:

For new container:
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lxc launch ubuntu  -c security.nesting=true
For a currently running container:
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lxc stop container

lxc config set container security.nesting true

lxc start container