[Bug 879710] Re: ubuntu-vm-builder crashes when trying to umount tmp directory.

[heechul yun]

A simple workaround is simply add some sleep as follows.

    def unmount_dev(self):
        self.context.cancel_cleanup(self.unmount_dev)
        run_cmd('sleep', '10');  // <--- add this line. 
        run_cmd('umount', '%s/dev' % self.context.chroot_dir)

Above

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https://bugs.launchpad.net/bugs/879710

Title:
  ubuntu-vm-builder crashes when trying to umount tmp directory.

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