docs(contributing): add instructions to install grunt-cli/bower globally on unix systems

Closes #5814
Closes #5811

1 files changed, 10 insertions, 0 deletions

diff --git a/docs/content/misc/contribute.ngdoc b/docs/content/misc/contribute.ngdoc
index 6713a06f..5c7c2601 100644
--- a/docs/content/misc/contribute.ngdoc
+++ b/docs/content/misc/contribute.ngdoc
@@ -87,6 +87,16 @@ grunt package
 Administrator). This is because `grunt package` creates some symbolic links.
 </div>
 
+<div class="alert alert-warning">
+**Note:** If you're using Linux, and npm install fails with the message 
+'Please try running this command again as root/Administrator.', you may need to globally install grunt and bower:
+<ul>
+<li>sudo npm install -g grunt-cli</li>
+<li>sudo npm install -g bower</li>
+</ul>
+
+</div>
+
 The build output can be located under the `build` directory. It consists of the following files and
 directories: