Linux – How to install MonoDevelop 2.2 on Ubuntu 9.10

it's really non-geek if you follow the instructions to the letter. Fire up Terminal, and type the following line :

sudo apt-get dist-upgrade

There's a way with Synaptics, but trust me, this is waaaay easier.

EDIT : Missed out that OP wanted to upgrade to 9.10, which hasn't been released yet.

Do the above pre-edit answer first to upgrade to 9.04 (just to be safe). Then :

Type in Terminal

update-manager -d

Update Manager should open up and tell you: New distribution release '9.10' is available. Click Upgrade and follow the on-screen instructions.

Keryx may work for you. This AskUbuntu question explains it's usage a bit more.