Ubuntu 15.04 - Notebook instalation

I have been having loads of problems with my notebook hanging over the last 6 months and I have decided that I am going to replace Windows 8.1 with Ubuntu 15.04.

After a default installation I have installed the following software:

VirtualBox

Debian-based Linux distributions

Add the following line to your /etc/apt/sources.list:

deb http://download.virtualbox.org/virtualbox/debian vivid contrib

According to your distribution, replace 'vivid' by 'utopic', 'trusty', 'raring', 'quantal', 'precise', 'lucid', 'jessie', 'wheezy', or 'squeeze'.
(Up to version 3.2 the packages were located in the non-free section. Starting with version 4.0 they are located in the contrib section.)
The Oracle public key for apt-secure can be downloaded here. You can add this key with

sudo apt-key add oracle_vbox.asc

or combine downloading and registering:

wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -

The key fingerprint is

7B0F AB3A 13B9 0743 5925 D9C9 5442 2A4B 98AB 5139 Oracle Corporation (VirtualBox archive signing key) <info@virtualbox.org>

(As of VirtualBox 3.2, the signing key was changed. The old Sun public key for apt-secure can be downloaded  here.)
To install VirtualBox, do

sudo apt-get update 

sudo apt-get install virtualbox-4.3

Google Chrome

$ wget -c https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
$ sudo dpkg -i google-chrome-stable_current_amd64.deb
$ sudo rm -rf google-chrome-stable_current_amd64.deb

Skype

Canonical Partners repository finally adds support for Ubuntu 15.04. Here’s how to enable the repository and install Skype 4.3 in Vivid Vervet
1. Enable Canonical Partners Repository:
The partner repository offer access to proprietary and closed-source software and are not enabled by default.
To enable it, launch Software & Updates from the Unity Dash, go to Other Software tab. Check the first two boxes which say “Canonical Partners” and “Canonical Partners(Source Code)”.

If for some reason, you don’t see them in the list, click Add button and add below lines one by one:

deb http://archive.canonical.com/ubuntu vivid partner
deb-src http://archive.canonical.com/ubuntu vivid partner

2. Install Skype
If you have Synaptic Package Manager installed (available in Software Center), you’re now able to search for and install skype after clicking reload in Synaptic.
If not, press Ctrl+Alt+T on keyboard to open terminal. When it opens, run the commands below one by one to refresh system cache and install skype.

sudo apt-get update

sudo apt-get install skype skype-bin

Once installed, launch Skype from the Dash/Menu and enjoy!

WINE

$ sudo add-apt-repository ppa:ubuntu-wine/ppa
$ sudo apt-get update
$ sudo apt-get install wine1.7 winetricks

Popcorn Time

sudo add-apt-repository ppa:webupd8team/popcorntime
sudo apt-get update
sudo apt-get install popcorn-time