These are the relevant errors:

  EXT4-fs (sda2): INFO: recovery required on readonly filesystem
  EXT4-fs (sda2): write access unavailable, cannot proceed

Unfortunately, there is no way to mount an ext3 filesystem that requires
recovery without replaying the journal and thus causing writes to that
partition.  os-prober used to replay the journal, but that caused
serious data-loss bugs in some cases so we stopped doing that.

The workaround is simply to perform recovery on the filesystem in
question using the 'fsck' tool.  I regret the need for this, but
unfortunately the alternative is worse.

As for why your Maverick system always needs recovery, I can't say.
Perhaps it isn't shutting down cleanly?

** Changed in: os-prober (Ubuntu)
       Status: New => Won't Fix

** Changed in: os-prober (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/683355

Title:
  Natty os-prober fails to detect Maverick installation

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