I'm new to debian - actually Knoppix on a hard disk. Added an internet
source to sources.list: deb http://mirror.aarnet.edu.au/pub/debian/
unstable main non-free contrib
apt-get update
The command apt-get update looks at all the packages installed on your hard disk, and checks to see if there are upgrades to any of them in whatever distribution is specified in your sources.list. In your case this is the unstable distribution, which as you've found contains a large number of updates.
If you now issue the command
apt-get -u upgrade
you will see a list of all the packages that could be upgraded. Do not be alarmed, because at the end of this list, you will be asked Do you want to continue? Answer No.
John
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