updating installation instructions to include some dependencies

Author: vsoch

pages/docs/user-docs/docs-quick-start-installation.md

@@ -10,14 +10,38 @@ If you already have Singularity installed, or if you are using Singularity from
 ```bash
 $ mkdir ~/git
 $ cd ~/git
-$ git clone https://github.com/gmkurtzer/singularity.git
+$ git clone https://github.com/singularityware/singularity.git
 $ cd singularity
 $ ./autogen.sh
 $ ./configure --prefix=/usr/local --sysconfdir=/etc
 $ make
 $ sudo make install
 ```
 
+If you get an error that you have packages missing, for example on Ubuntu 16.04:
+
+
+```bash
+ ./autogen.sh
++libtoolize -c
+./autogen.sh: 13: ./autogen.sh: libtoolize: not found
++aclocal
+./autogen.sh: 14: ./autogen.sh: aclocal: not found
++autoheader
+./autogen.sh: 15: ./autogen.sh: autoheader: not found
++autoconf
+./autogen.sh: 16: ./autogen.sh: autoconf: not found
++automake -ca -Wno-portability
+./autogen.sh: 17: ./autogen.sh: automake: not found
+```
+
+then you need to install dependencies:
+
+
+```bash
+sudo apt-get install -y build-essential libtool autotools-dev automake autoconf
+```
+
 You should note that the installation prefix is `/usr/local` but the configuration directory is `/etc`. This is done such that the configuration file is in the traditionally found location. If you omit that configure parameter, the configuration file will be found within `/usr/local/etc`.