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While upgrading to 13.10, my system froze and required a hard reboot. After rebooting, it appears that 13.10 did actually install, but I cannot reboot. System freezes on the purple ubuntu screen. This happens for all reboot methods I could think of including alt+prtScn+b. Shutdown works fine. Any ideas?

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From what I can tell, this is a Grub2 problem. Try using Boot Repair.

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