How to use Update Manager to update your Ubuntu system 12.04
1.Click the gear icon on the far right end of the panel at the top of your Ubuntu 12.04 desktop.2. Choose the Updates Available option.
3. Update Manager will open and refresh itself (or you can click the Check button to manually do it).
4. By default all of the updates will be checked, but you can uncheck the ones you don't want.
5. When you're ready to update, click the Install Updates button.
6. Type in your password.
7. Click the Authenticate button to begin updating your Ubuntu 12.04 system.
Howto- Install Skype in Ubuntu 12.04 Precise PangolinTo get started go to this website and download a version for your system. You can choose a 32-bit or 64-bit version for your system.
When prompted, choose ‘Open with Ubuntu Software Center (default)’
Then click the ‘Install’ button to install it.
Installing jdk7 in ubuntu 12.04 (64 bit)
This way has always worked for me:
sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java7-installer