Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
The first video in this pair shows you how to update all the software in your Ubuntu GNU/Linux installation in a single, big gulp. The second video shows you how easy it is to install and remove software with the Synaptic Package Manager.
When you update Ubuntu -- or, for that matter, any well-run Linux distribution -- you are not just updating the operating system, but all the software you originally installed along with it, plus any software you added later through your distribution's online software repositories.
When you use Ubuntu -- or Debian, Red Hat, Fedora, SUSE, Mandriva or just about any other "major" distribution out there -- your life is almost always easier if you get most or all of your software through your distribution instead of directly from the people who wrote it, unless you're experimenting in some way or need specialized software not available through your distro (as distributions are often called for short). Two big reasons for sticking to distro-supplied software are: