[Bug 1625358] Re: os-prober tries to mount bios_grub (BIOS boot) partition

[Alberto Salvia Novella]

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

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

Status in os-prober package in Ubuntu:
  Confirmed

Bug description:
  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)

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