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Ubuntu server 12.04.1 running from usb-hdd is rock solid for months. After copying the partitions to a Kingston usb pendrive the system will only run for 3-4 days before some services fail.

Is running 12.04.1 from usb pendrive a viable approach?

How do I troubleshoot the problem?

In the meanwhile, I have reverted back to usb-hdd. Willing to buy a usb pendrive that is known to work. Recommendations?

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Your pendrive is just flaky. I don't have a specific recommendation for brand, aside from "spend a little more" and specifically look for one advertising fast USB2.0 or (better) USB3.0 access. You generally get what you pay for, and cheap pendrives aren't really designed or tested for long-term connection with heavy usage.

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