If you installed Eclipse from the Ubuntu repositories, your software sites list might be emty. In that case, Eclipse won’t update itself and you won’t be able to install new software.
Here is a way you can fix this. Go to help->install new software->click on the blue hyperlink “Available software sites”
Now either import the bookmarks.xml with this as contents or do it manually.
Continue reading List of update and software sites in Eclipse
When I installed Ubuntu 9.10, my num pad stopped working as it used to – it moved the mouse instead of inputing numbers. Pressing num lock didn’t help either.
Anyway I found the solution quickly on Ubuntu forums:
It appears it’s some accessibility feature. I probably pressed some key combo that turned it on.