Hello,

If you boot using the CD when you start the installation a partitioning tool should come up during the process. I would create a partition of around 16GB for the installation of Ubuntu and the rest for Swap space.

If you have already shrunk your windows partition, just choose "install into free space" and it will automatically make a swap and a / partition of you of the size it sees fit.

Your partitions have been made using the windows partition manager I presume. The 20gb partition oyu created is likely the larget continous free space in your HD. If it is, the when booting form the ubuntu cd, choose "install in the largest continous free space". You likely will get a 19gb drive for ubuntu, that is likely plenty, if you intend to continue using windows too, and not Ubuntu exclusively. Have fun! Ubuntu is great...BTW what make is the computer?

Cheupe

That is likely plenty, if you intend to continue using windows too, and not Ubuntu exclusively. Have fun! Ubuntu is great...BTW what make is the computer?
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for your 20GB i'd recommend, make 100MB "/boot" primary partition, 2GB swap pariition and the rest primary root "/" partition