I've got an old Windows machine that I want to replace with Ubuntu. I dont want to have Windows on the machine any more. How do I make that happend?
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1What have you tried? Just run the installation, really. It will offer you the option. – gertvdijk Jun 23 '13 at 22:16
2 Answers
If it is an old machine, use better Xubuntu or Lubuntu, which are less demanding to system resources. If you like to use ubuntu, use maximum RAM (2-4 GB is ok). With less memory you can run ito the troubles and performance can be slow then.
Easy steps: download ISO, burn ISO, install. You can use official guidelines: https://help.ubuntu.com/community/Installation

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Before you begin, make sure you've got backups of any files you may need from the old Windows machine.
Next, simply follow the official installation instructions:
- Ubuntu 12.04 LTS http://www.ubuntu.com/download/desktop/install-desktop-long-term-support
- Ubuntu 13.04 http://www.ubuntu.com/download/desktop/install-desktop-latest
The basic process involves:
- downloading the version of Ubuntu you want to install (http://www.ubuntu.com/download/desktop)
- making a bootable USB, CD, or DVD
- boot up the computer using the USB/CD/DVD you just made
- follow the on-screen installation instructions. one of the installation steps asks you about disk allocation/partitioning -- select the "replace my current operating system" option in step 4.
Good luck, and enjoy Ubuntu!
If you encounter difficulties during the installation, or afterward, please check back with AskUbuntu to see if a similar question has been asked, and if not, feel free to ask a new question here for more help

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1Depending on the age of your laptop you may experience performance issues with the older hardware. That's why I included the link to installing 12.04 LTS which may be a better option for you than 13.04. Otherwise, @Dee is correct: you may want to consider Xubuntu or Lubuntu which are less intensive variants of the standard Ubuntu. – amc Jun 23 '13 at 20:02