Public bug reported:

After a kernel update, update-grub is triggered and calls os-prober,
which tries to mount a BIOS boot or bios_grub partition, this

[ 4207.126455] SGI XFS with ACLs, security attributes, realtime, no debug 
enabled
[ 4207.179019] JFS: nTxBlock = 8192, nTxLock = 65536
[ 4207.237139] ntfs: driver 2.1.32 [Flags: R/O MODULE].
[ 4207.312000] QNX4 filesystem 0.2.3 registered.
[ 4207.504556] EXT4-fs (sda1): VFS: Can't find ext4 filesystem
[ 4207.508148] EXT4-fs (sda1): VFS: Can't find ext4 filesystem
[ 4207.511768] EXT4-fs (sda1): VFS: Can't find ext4 filesystem
[ 4207.516335] squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on 
sda1
[ 4207.520951] FAT-fs (sda1): invalid media value (0x7d)
[ 4207.520962] FAT-fs (sda1): Can't find a valid FAT filesystem
[ 4207.537370] XFS (sda1): Invalid superblock magic number
[ 4207.572688] FAT-fs (sda1): invalid media value (0x7d)
[ 4207.572699] FAT-fs (sda1): Can't find a valid FAT filesystem
[ 4207.582957] VFS: Can't find a Minix filesystem V1 | V2 | V3 on device sda1.
[ 4207.605925] hfsplus: unable to find HFS+ superblock
[ 4207.613271] qnx4: no qnx4 filesystem (no root dir).
[ 4207.617614] ufs: You didn't specify the type of your ufs filesystem
                                                                                
                                                      
               mount -t ufs -o 
ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...    
                       
                                                                                
                                                      
               >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default 
is ufstype=old                                        
[ 4207.617978] ufs: ufs_fill_super(): bad magic number
[ 4207.622340] hfs: can't find a HFS filesystem on dev sda1


A similar patch[1] like the one added in bug 1374759 could fix this, but for 
the corresponding partition type.

[1] https://launchpadlibrarian.net/247090905/skip-msdos-extpart-
sooner.debdiff

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: os-prober 1.70ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic i686
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: i386
Date: Mon Sep 19 15:16:42 2016
Dependencies:
 gcc-6-base 6.0.1-0ubuntu1
 libc6 2.23-0ubuntu3
 libgcc1 1:6.0.1-0ubuntu1
InstallationDate: Installed on 2016-09-18 (1 days ago)
InstallationMedia: Ubuntu-MATE 16.04.1 LTS "Xenial Xerus" - Release i386 
(20160719)
SourcePackage: os-prober
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: os-prober (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 xenial

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https://bugs.launchpad.net/bugs/1625358

Title:
  os-prober tries to mount bios_grub (BIOS boot) partition

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