Update linux.md to accomadate build issues

I ran into this when I installed today, and the inscribed method allowed me to complete my atom install on CrunchBang. I've seen a few issues having to do with this, so it might be advisable to have it in the troubleshooting section!

docs/build-instructions/linux.md

@@ -61,6 +61,10 @@ and restart Atom.  If Atom now works fine, you can make this setting permanent:
 
 See also https://github.com/atom/atom/issues/2082.
 
+### /usr/bin/env: node: No such file or directory
+
+If you get this notice when attemtping to ```script/build,``` you have either neglected to install nodejs, or node is identified as nodejs in your system. If the latter, entering ```sudo ln -s /usr/bin/nodejs /usr/bin/node``` into your terminal may fix the issue.
+
 ### Linux build error reports in atom/atom
 * Use [this search](https://github.com/atom/atom/search?q=label%3Abuild-error+label%3Alinux&type=Issues)
   to get a list of reports about build errors on Linux.