My general advice is to save your /home directory. You should also save your installed applications as a list and restore them. I have that on a "cheat sheet" at home and I don't want to try to tell you how to do that from memory. Someone will have it shortly, I imagine. I'd also save your hosts file and some others. Sorry. Cheat sheet again.
Do the above in either case, but I usually recommend a clean install over an upgrade. Your choice.
If you decide to do an upgrade, have a look here for how to do it from GUI. This is for upgrade to Karmic, but the steps are the same.
http://www.ubuntu.com/getubuntu/upgrading
If you want to do it from the command line, the preferred method is
Get your current version up to date:
Code:
sudo apt-get update
Code:
sudo apt-get upgrade
Code:
sudo apt-get dist-upgrade
If you don't have it, do
Code:
sudo apt-get install update-manager-core
And finally
Code:
sudo do-release-upgrade
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