title: Error when running npm install -g generator-hyperledger-composer@0.20
body: <p>This statement is to install a <strong>useful utility for generating application assets</strong>. The installation is on Ubuntu running in a VM on a Windows 10 laptop. The script ran to completion but there were two ERR messages together in the output. <strong>Are these messages significant or can I ignore them?</strong></p>
  
  <blockquote>
    <p>Messages:
    node-pre-gyp ERR! Pre built binaries not installable for grpc@1.10.1 and node@8.11.4 (node v-57 ABI, glibc) (falling back to source compile with node-gyp)
    node-pre-gyp ERR! Hit error getaddrinfo EAI_AGAIN storage.googleapis.com:443**</p>
  </blockquote>