Good to see you are learning
A bit of an explanation here will help you out.
Repositories are server which have all the packages you need for installing stuff (dependencies, libraries, etc ,etc not just the program you want)
Synaptic has to go look at a file in /etc/apt/ called sources.list
deb
http://archive.canonical.com/ubuntu hardy partner
# deb-src
http://archive.canonical.com/ubuntu hardy partner
deb
http://security.ubuntu.com/ubuntu hardy-security main restricted
#deb-src
http://security.ubuntu.com/ubuntu hardy-security main restricted
deb
http://security.ubuntu.com/ubuntu hardy-security universe
#deb-src
http://security.ubuntu.com/ubuntu hardy-security universe
deb
http://security.ubuntu.com/ubuntu hardy-security multiverse
#deb-src
http://security.ubuntu.com/ubuntu hardy-security multiverse
deb
http://download.virtualbox.org/virtualbox/debian hardy non-free
Any line that has a # in front, is what is called commented out, apt or synaptic wont use it since the system takes the # symbol as a comment, you could write stuff in there if you want to remember something which wont make any sense to the system but since it has the # symbol it wont get read or interpreted by it.
So when it told you that some repositories in ubuntu are not enable is that they have the # symbol in front you could do it manually in that file, but go into synaptic>configuration>repositories, you can enable them there, then you do a package reload, and all the other packages in that repositories will show up
Tor is a proxy system to let you bypass blocks on the system, for more info:
htt://www.torproject.org/
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