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I have recently installed Ubuntu 12.04.2 LTS by USB on my newly built custom PC and I have run into a problem during installation with the error saying

No root file system is defined.

My PC specifications:

  • AMD Phenom x4 955 Black Edition
  • ASRock 960GM/U3S3 FX Micro ATX AM3+ Motherboard
  • Mushkin Redline 8GB (2x4GB) DDR3-1866 Memory
  • Seagate Barracuda 1.5TB 3.5" 7200RPM Internal Hard Drive
  • XFX Radeon HD 7850 1GB Video Card
  • XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply

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3 Answers 3

Reset to default
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At the partitioning step, select the partition you want to have Ubuntu installed on, click the "Change" button, and select / as "Mount point". Then click "Install now".

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You should do the custom installation and follow this link to a video guide that will help you through the steps. It was a quick search on Youtube. His voice is low so you might want to turn it up a bit. The video will show you how it's done.

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For that partition where you install Linux chose "/" as mount option, for Swap partition chose "SWAP" and for Data partitions choose "/home".

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