Quoting Aleksandr Levchuk (firstname.lastname@example.org): > Package: os-prober > Version: 1.39 > Severity: important > > > An upgrade (os-prober 1.35 -> 1.39) corrupted 3.3 TB of data on our SAN. Sigh. From what I've witnessed over the years, os-prober has always been designed as a component of Debian Installer, used to properly setup boot loaders' menus at install time. Apparently, recent evolutions turned it to be installed on running systems *because* grub recommends it. However, I'm not sure it has ever been designed to be used in a regular system context...hence these problems. Joey Hess, in http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=476184, explicitly mentioned that grub2 should *suggest* os-prober. Dealing with #491872, grub2 maintainers apparently decided to bump the dependency to "Recommends". I don't see a really strong rationale in that bug report, particularly in lighht to problem like yours. So, my advice is to upgrade this to RC severity, reassign the bug to grub2 to have it relax its dependency.
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