Sorry, my bug description was not correct: By accident "notail" was _not_ set. The workaround mentioned on the Ubuntu bug tracker worked:
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/464743/comments/6 Suggestion: Maybe the grub2 postinst script could issue a warning for reiserfs and a missing notail option? Many thanx Harri
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