title: Can't install/update heroku toolbelt - heroku-pipelines
body: <p>I'm having problems updating with heroku toolbelt (on Ubuntu x64).</p>
  
  <p>Whatever heroku command I try to run, heroku toolbelt will try to update itself and the update always fails with this output:</p>
  
  <pre><code>$ heroku
  heroku-cli: Installing Toolbelt v4... done
  For more information on Toolbelt v4: https://github.com/heroku/heroku-cli
  heroku-cli: Adding dependencies... done
  heroku-cli: Installing core plugins (retrying)...
   ▸    Error reading plugin: heroku-pipelines
   ▸    exit status 1
   ▸    module.js:327
   ▸        throw err;
   ▸        ^
   ▸    
   ▸    Error: Cannot find module 'heroku-pipelines'
   ▸        at Function.Module._resolveFilename (module.js:325:15)
   ▸        at Function.Module._load (module.js:276:25)
   ▸        at Module.require (module.js:353:17)
   ▸        at require (internal/module.js:12:17)
   ▸        at [eval]:2:15
   ▸        at Object.exports.runInThisContext (vm.js:54:17)
   ▸        at Object.&lt;anonymous&gt; ([eval]-wrapper:6:22)
   ▸        at Module._compile (module.js:397:26)
   ▸        at node.js:611:27
   ▸        at nextTickCallbackWith0Args (node.js:452:9)
  heroku-cli: Installing core plugins (retrying)...
   ▸    Error reading plugin: heroku-pipelines
   ▸    exit status 1
   ▸    module.js:327
   ▸        throw err;
   ▸        ^
   ▸    
   ▸    Error: Cannot find module 'heroku-pipelines'
   ▸        at Function.Module._resolveFilename (module.js:325:15)
   ▸        at Function.Module._load (module.js:276:25)
   ▸        at Module.require (module.js:353:17)
   ▸        at require (internal/module.js:12:17)
   ▸        at [eval]:2:15
   ▸        at Object.exports.runInThisContext (vm.js:54:17)
   ▸        at Object.&lt;anonymous&gt; ([eval]-wrapper:6:22)
   ▸        at Module._compile (module.js:397:26)
   ▸        at node.js:611:27
   ▸        at nextTickCallbackWith0Args (node.js:452:9)
   !    error getting commands pid 8898 exit 1
  </code></pre>
  
  <p>I've removed my ~/.heroku, I've apt-get remove --purge heroku*, and still it just fails.</p>
  
  <p>I'm not that familiar with node.js to understand what kind of problem this is or if it even is a node.js problem at all.. Does anyone have a clue? Thanks!</p>