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Would it be safe to uninstall Windows XP on my computer and just boot to Ubuntu? I am using an older computer with a 40 gig HD, 3GB processor and just under 2 GB ram. I do not have much space left on my drive. If can be don

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No need to uninstall XP, Ubuntu works OK in dual boot. If you are beginning with linux, dual boot is pretty useful.

For that configuration you can do with a 4 GB swap and a 5 GB as a minimal for the OS.

Also making a backup of your sensitive data before installation is still valid.

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Yes, but you should backup your sensitive data before installation.

Minimal Requirements for Ubuntu Desktop:

  1. 700 MHz processor (about Intel Celeron or better)

  2. 512 MiB RAM (system memory)

  3. 5 GB of hard-drive space (or USB stick, memory card or external drive but see LiveCD for an alternative approach)

  4. VGA capable of 1024x768 screen resolution

  5. Either a CD/DVD drive or a USB port for the installer media

  6. Internet access is helpful

There's also variants of Ubuntu like Lubuntu or Kubuntu which they will run on even weaker PC.

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