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I have installed Ubuntu 14 onto my external hard drive and everything initially works great. However after an apparently random amount of time (although this has happened every time I have been running Ubuntu on the hard drive) everything completely freezes and I have to do a hard restart.

Can anyone suggest any reasons why this might be happening or how I can go about fixing this?

Firefly09
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  • possible duplicate of [What should I do when Ubuntu freezes?](http://askubuntu.com/questions/4408/what-should-i-do-when-ubuntu-freezes) or [How to check my HDD's for defects](http://askubuntu.com/questions/79956/how-to-check-my-hdds-for-defects) – Eliah Kagan Aug 07 '14 at 10:16
  • You are not using NFS by chance, do you? – Barafu Albino Aug 07 '14 at 11:34

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I have fixed the problem by opening the NVIDIA X Server Settings application and changing the graphics profile from NVIDIA to Intel, but thanks for the other answers.

Firefly09
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