This guide shows how you can upgrade your Ubuntu Oneiric Ocelot (11.10) desktop and server installations to Ubuntu Precise Pangolin (12.04).
Start the Update Manager (System -> Administration -> Update Manager)
or if you use Ubuntu Unity GUI, then you can start Upgrade Manager via "Ubuntu Icon" (Dash Home) -> More Apps -> System -> Update Manager
The Update Manager should show that a new distribution release (12.04) is available.
So kindly click on the Upgrade button to start the distribution upgrade.
A window with the release notes for 12.04 comes up. Click on Upgrade again.
The upgrade tool is now being downloaded. Afterwards, type in your password. Finally after that click on Start Upgrade to finally begin with the upgrade process.
Now you can see the new upgrade packages are now being downloaded and installed. Obviously depending on your speed of internet connection, this will take some time.
At the end of the upgrade process, you can now remove the old obsolete packages.
Now the upgrade is done and the system needs to be rebooted to complete the upgrade, therefore click on "Restart Now".
When you log in, you can see the new Ubuntu 12.04 will by default start the new Unity desktop.
And that is it, your upgrade of Ubuntu is all over!
Some of the changes/upgrades done in Precise Pangolin are:
Ubuntu will promote 64-bit images starting with Precise Pangolin. This means that when you go to Ubuntu.com and click to download Ubuntu, the 64-bit image will be selected by default. You can of course choose to download 32-bit images instead if you want to. Precise Pangolin ISO size will increase to 750MB which means it won't fit on a CD anymore so you'll need either an USB stick or DVD.
Other Unity Greeter changes:
- widgets which are themed
- make login box look like lenses
- design and implement session/password changer
- design improvements
Ubuntu Software Center will get a huge list of improvements. Also currently the startup time is around 11.2 seconds, the goal for the new Ubuntu Precise Pangolin is a value under 2 seconds! I hope this is a sweet change which everyone would love it. The default music player Banshee will probably be replaced by Rhythmbox as the default music player in Ubuntu 12.04.
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