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[Thiago Martins <thiagocmartinsc@xxxxxxxxx>]

I'm seeing this BUG on most recent Xenial Beta release (updated today).

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https://bugs.launchpad.net/bugs/1374759

Title:
  >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is
  ufstype=old

Status in initramfs-tools package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Triaged
Status in os-prober package in Ubuntu:
  Confirmed
Status in os-prober package in Debian:
  Fix Released

Bug description:
  [  556.734157] SGI XFS with ACLs, security attributes, realtime, large block/inode numbers, no debug enabled
  [  556.746268] JFS: nTxBlock = 8192, nTxLock = 65536
  [  556.763789] ntfs: driver 2.1.30 [Flags: R/O MODULE].
  [  556.792231] QNX4 filesystem 0.2.3 registered.
  [  557.922469] EXT4-fs (sda4): unable to read superblock
  [  557.925868] EXT4-fs (sda4): unable to read superblock
  [  557.928967] EXT4-fs (sda4): unable to read superblock
  [  557.931784] FAT-fs (sda4): bogus number of reserved sectors
  [  557.931791] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  557.946740] XFS (sda4): Invalid superblock magic number
  [  557.951904] FAT-fs (sda4): bogus number of reserved sectors
  [  557.951911] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  557.959099] MINIX-fs: unable to read superblock
  [  557.965712] attempt to access beyond end of device
  [  557.965721] sda4: rw=16, want=3, limit=2
  [  557.965725] hfsplus: unable to find HFS+ superblock
  [  557.968487] qnx4: no qnx4 filesystem (no root dir).
  [  557.971203] 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
  [  557.974459] hfs: can't find a HFS filesystem on dev sda4
  [  564.034208] EXT4-fs (sda4): unable to read superblock
  [  564.040322] EXT4-fs (sda4): unable to read superblock
  [  564.043485] EXT4-fs (sda4): unable to read superblock
  [  564.047076] FAT-fs (sda4): bogus number of reserved sectors
  [  564.047083] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  564.059578] XFS (sda4): Invalid superblock magic number
  [  564.064473] FAT-fs (sda4): bogus number of reserved sectors
  [  564.064489] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  564.072080] MINIX-fs: unable to read superblock
  [  564.074564] attempt to access beyond end of device
  [  564.074571] sda4: rw=16, want=3, limit=2
  [  564.074576] hfsplus: unable to find HFS+ superblock
  [  564.076688] qnx4: no qnx4 filesystem (no root dir).
  [  564.078847] 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
  [  564.080902] hfs: can't find a HFS filesystem on dev sda4
  [  570.554296] EXT4-fs (sda4): unable to read superblock
  [  570.557647] EXT4-fs (sda4): unable to read superblock
  [  570.560516] EXT4-fs (sda4): unable to read superblock
  [  570.563451] FAT-fs (sda4): bogus number of reserved sectors
  [  570.563460] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  570.574953] XFS (sda4): Invalid superblock magic number
  [  570.580796] FAT-fs (sda4): bogus number of reserved sectors
  [  570.580806] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  570.588340] MINIX-fs: unable to read superblock
  [  570.590983] attempt to access beyond end of device
  [  570.590993] sda4: rw=16, want=3, limit=2
  [  570.590999] hfsplus: unable to find HFS+ superblock
  [  570.593321] qnx4: no qnx4 filesystem (no root dir).
  [  570.595556] 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
  [  570.597775] hfs: can't find a HFS filesystem on dev sda4
  [  576.795014] EXT4-fs (sda4): unable to read superblock
  [  576.797554] EXT4-fs (sda4): unable to read superblock
  [  576.800063] EXT4-fs (sda4): unable to read superblock
  [  576.802647] FAT-fs (sda4): bogus number of reserved sectors
  [  576.802655] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  576.813305] XFS (sda4): Invalid superblock magic number
  [  576.820257] FAT-fs (sda4): bogus number of reserved sectors
  [  576.820276] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  576.830945] MINIX-fs: unable to read superblock
  [  576.834108] attempt to access beyond end of device
  [  576.834119] sda4: rw=16, want=3, limit=2
  [  576.834125] hfsplus: unable to find HFS+ superblock
  [  576.837264] qnx4: no qnx4 filesystem (no root dir).
  [  576.840408] 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
  [  576.843535] hfs: can't find a HFS filesystem on dev sda4

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-18-generic 3.16.0-18.25
  ProcVersionSignature: Ubuntu 3.16.0-18.25-generic 3.16.3
  Uname: Linux 3.16.0-18-generic x86_64
  ApportVersion: 2.14.7-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  caravena   2117 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Sat Sep 27 10:39:43 2014
  HibernationDevice: RESUME=UUID=360bd2d2-4f44-4311-86d6-4781ac81ee87
  InstallationDate: Installed on 2014-09-25 (2 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140923)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.16.0-18-generic root=UUID=0fb75fae-baa3-428b-ace4-498e69ff7fb6 ro rootflags=subvol=@ quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-18-generic N/A
   linux-backports-modules-3.16.0-18-generic  N/A
   linux-firmware                             1.134
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/15/2013
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: P14AAJ
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: SAMSUNG_NP1234567890
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
  dmi.product.name: 530U3C/530U4C
  dmi.product.version: 0.1
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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