extra)
  config.vm.provision 'install dependencies', type: 'shell', inline:  <<-SHELL
    set -e
    set -o pipefail

    # Retry install command up to $2 times, if failed
    retry_installcommand() {
      n=0
      while true; do
        #{install_command} $1 && break
        let n=n+1
        if [ $n -ge $2 ]; then
          echo "==> Exhausted retries to install $1"
          return 1