When you are on the Ubuntu server console, you will invariably run commands that scroll past too far to see them on the screen. Since you aren’t in X, there’s no scrollbar for you to use to look back.
If the Ubuntu Server installer has set your server to use DHCP, you will want to change it to a static IP address so that people can actually use it.
If you’ve installed your Ubuntu installation with DHCP, it’s really easy to reconfigure your system to use a static IP address with the GUI based Network Settings dialog.
Ubuntu has a trash can/recycle bin feature similar to windows. The difference with Ubuntu is that you can empty the trash from the command line.
The Ubuntu file browser does not show hidden files or folders by default, only the files that your user has access to.
If you are running an Ubuntu guest in VMware, you may have found that you cannot switch into the Console mode using Ctrl+Alt+F1. If you try, you will encounter a blank screen and won’t see a login prompt at all.