[kubuntu] grub rescue intermittent failure

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http://ubuntuforums.org – Lenovo Thinkpad E520 about 14 months old, Kubuntu 12.04 LTS, all current patches. Dual-boot Win7. Intermittently goes into grub rescue at boot time. Message "partition not found". It does this maybe 5% of times on power-up. After a few power-down, power-up sequences, the problem goes away... (Hardware)