Ubuntu the worldmost popular distro has launched its new distro called Vivid Vervet (15.04). When I installed on my old lappy EMachine 732z(with 4GB RAM) I feel its quite responsive stable till now no single crash. The biggest let down for me is it still uses unity 7 and I was expecting unity 8. Every one want to customize its OS own way , I have done something to improve my experience , hope you will like it.
1. Updating Repos ...
Open Terminal and run this command
sudo apt-get update
2. Installing VLC
Vivid Vervet's movie player can play most of the multimedia format by default but I love VLC Player
sudo apt-get install vlc
3. Security and Privacy
By default ubuntu tracks our activities like what we search and show in dash, which I don't want. so go to Settings > Security & Privacy >
Disable Search then go to diagonostics and choose what will be sent to Canonical the Company behind Ubuntu.
4. Installed firefox extension adblock plus(for annoying Ads) and DownThemAll(Download Manager).
5. Removed Libre Office and Installed Kingsoft Office .
6. Updated System through Update Manager(around 73MB)
7. Installed Gimp (linux photoshop best alternative for Image Manuplation)
8. Install Ubuntu Tweak
First Impression of Ubuntu 15.04
Boot - 36 seconds
RAM usage on idle(in Start) - Around 370-390 MB (Using 64bit)
CPU Usage - 0-5%
A stable, secure , responsive OS, but if you have old hardware then consider Lubuntu or xubuntu . Runs smoothly on 2GB RAM