More Packages for UCK

Just add the repositories for the additional SW in synaptic, update and then install from the additional repositories.

By default (because at that point you are actually running in the system you are customizing) only the repositories enabled in a Ubuntu default install are available and we're not planning to change this, because it is already covered in synaptic.

If I do this in synaptic, what am I looking for? Is it "SW"?

SW is short for SoftWare - sorry for using an abbreviation.

For a guide on how to add repositories to synaptic see:
    https://help.ubuntu.com/community/SynapticHowto
specifically chapter 4.

As an alternative: google for ubuntu-tweak. That program
allows you to install commonly requested applications
like skype or vlc directly and is also quite useful to tweak
other settings.

Using ubuntu-tweak, you can install packages in UCK, but for UCK-FLOW, I'm using those lines:

- to uncomment i.e. enable existing repositories:
sudo cp /etc/apt/sources.list /etc/apt/sources.list.original
sudo sed -i -e "s/# deb/deb/g" /etc/apt/sources.list

- to add a package which is not in the repositories:
sudo apt-get install -y libqt4-dbus libqt4-network libqt4-xml # for skype 32bit
# sudo apt-get install -y ia32-libs lib32asound2 libqt4-core libqt4-gui # for skype 64bit
echo "deb http://download.skype.com/linux/repos/debian/ stable non-free" | sudo tee -a /etc/apt/sources.list > /dev/null
sudo apt-get install skype

- Wine and VLC are already in the repositories, although you could add for example Wine repository:
sudo add-apt-repository ppa:ubuntu-wine/ppa

Nice page with useful packages is here: http://ubuntuguide.org/