Same happens in Debian: https://bugs.debian.org/cgi- bin/bugreport.cgi?bug=772526
If you are not using multi boot, just remove the "os-prober" and it should work. Regards. ** Bug watch added: Debian Bug tracker #772526 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=772526 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to initramfs-tools in Ubuntu. 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 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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