When you first install, you will be presented with a choice on how you want to partition. The options, if you have Windows, are to automatically resize Windows and use the space freed for Ubuntu, format the entire drive automatically, or choose how you want the partitions set up (manual). Under the resize option,there will be a slider to give more or less space to Ubuntu and less to Windows.
After you've installed Linux, you can change the partitions either by using the manual option in the installer, or using another Linux LiveCD designed for this purpose, like GParted.
Recent versions of Ubuntu Linux require about 5GB of space.
disk space analyzer
Insert of your Ubuntu CD, then using GParted, delete your Windows partition and resize your Ubuntu partition until it fills the space left by the deleted partition.
sudo usermod -l [newusername] [oldusername]
GNOME Disk Usage Analyzer
Xubuntu and Ubuntu are two different versions of Ubuntu. (Ubuntu has GNOME.)
You will have less disk space available for OSes.
Allowed people to get around the wide-open space of the region
Go to the System menu, then Preferences, then Screen Resolution.
Use your Ubuntu CD. Find a program called "GParted" or "Gnome Partition Editor". Click on your XP partition and click "Resize" and make it smaller. Then, do the same with your Ubuntu partition, and drag it until it fills the space left by XP.
There is a GUI tool that you can use, or try the 'passwd' command in a terminal window.
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