Solving the package dependency list automatically for building ubuntu touch

I’m following the guide in XDA Link to install nexus 9 device with Ubuntu touch. But I’m stuck in the installation of tool-chain and cross compiler. I am stuck in the following

 sudo apt-get install gcc g++ git gcc-4.9-aarch64-linux-gnu g++-4.9-aarch64-linux-gnu libncurses5-dev

Throws error:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'gcc-4.9-aarch64-linux-gnu-base' for regex 'gcc-4.9-    aarch64-linux-gnu'
E: Unable to locate package g++-4.9-aarch64-linux-gnu
E: Couldn't find any package by regex 'g++-4.9-aarch64-linux-gnu'

So, I am downloading the required packages and installing manually using dpkg
Is there any shortcut for this?

I tried using gdebi. But did not help much.

I am using ubuntu 14.04-64 as host machine.

sudo apt-get install gcc g++ git gcc-*-aarch64-linux-gnu g++-*-aarch64-linux-gnu libncurses5-dev