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Since Ubuntu 12.10 (and possibly backported to Ubuntu 12.04) the following will work on Ubuntu: $ echo GRUB_RECORDFAIL_TIMEOUT=20 | sudo tee -a /etc/default/grub $ sudo update-grub $ sudo env DEBIAN_FRONTEND=noninteractive dpkg-reconfigure grub-pc The above was mentioned by Alex in Oct 2013 in response to Shane Madden's answer of Jan 2012. See comments ...


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Using grub2-install while migrating from a single disk to raid1, I had very similar symptoms, being multiple warning lines as follows. I wasn't willing to reboot just to "test" whether or not this was a fatal problem however. In my case I wanted to put /boot onto a 4-disk RAID1 while the other partitions were going to be separated 2-disk RAID1s: ...



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