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Thread: Ubuntu 12.04.3 installer can't see previous partitions but gparted does

  1. #1
    Join Date
    Feb 2011
    Beans
    11

    Ubuntu 12.04.3 installer can't see previous partitions but gparted does

    As written in the topic Gparted can see partitions on the hard disk, but when i install device is partition free.

    I'm installing on a system with uefi and secure boot support, but they should be both disabled.
    I already installed ubuntu before but single boot and all worked fine.
    I'm now trying to install Ubuntu with Windows 7 with dual boot.
    Windows 7 is already installed and working.


    Boot info script
    Code:
                      Boot Info Script 0.61      [1 April 2012]
    
    
    ============================= Boot Info Summary: ===============================
    
     => Windows is installed in the MBR of /dev/sda.
     => Syslinux MBR (3.00-3.35) is installed in the MBR of /dev/sdb.
    
    sda1: __________________________________________________________________________
    
        File system:       ntfs
        Boot sector type:  Windows Vista/7: NTFS
        Boot sector info:  No errors found in the Boot Parameter Block.
        Operating System:  
        Boot files:        /bootmgr /Boot/BCD
    
    sda2: __________________________________________________________________________
    
        File system:       ntfs
        Boot sector type:  Windows Vista/7: NTFS
        Boot sector info:  No errors found in the Boot Parameter Block.
        Operating System:  Windows 7
        Boot files:        /Windows/System32/winload.exe
    
    sdb1: __________________________________________________________________________
    
        File system:       vfat
        Boot sector type:  SYSLINUX 4.06 2012-10-23
        Boot sector info:  Syslinux looks at sector 16392 of /dev/sdb1 for its 
                           second stage. The integrity of Syslinux couldn't be 
                           verified (install gawk). SYSLINUX is installed in the  
                           directory. The 2 ADV sectors are not the same 
                           (corrupt). No errors found in the Boot Parameter Block.
        Operating System:  
        Boot files:        /boot/grub/grub.cfg /syslinux.cfg 
                           /efi/BOOT/grubx64.efi /ldlinux.sys
    
    ============================ Drive/Partition Info: =============================
    
    Drive: sda _____________________________________________________________________
    
    Disk /dev/sda: 500.1 GB, 500107862016 bytes
    255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 4096 bytes
    
    Partition  Boot  Start Sector    End Sector  # of Sectors  Id System
    
    /dev/sda1    *          2,048       206,847       204,800   7 NTFS / exFAT / HPFS
    /dev/sda2             206,848   419,432,447   419,225,600   7 NTFS / exFAT / HPFS
    
    
    GUID Partition Table detected, but does not seem to be used.
    
    Partition    Start Sector    End Sector  # of Sectors System
    
    Drive: sdb _____________________________________________________________________
    
    Disk /dev/sdb: 4127 MB, 4127195136 bytes
    255 heads, 63 sectors/track, 501 cylinders, total 8060928 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    
    Partition  Boot  Start Sector    End Sector  # of Sectors  Id System
    
    /dev/sdb1    *          2,048     8,060,927     8,058,880   c W95 FAT32 (LBA)
    
    
    "blkid" output: ________________________________________________________________
    
    Device           UUID                                   TYPE       LABEL
    
    /dev/loop0                                              squashfs   
    /dev/sda1        F6E26547E2650D65                       ntfs       Riservato per il sistema
    /dev/sda2        AAD4725BD47229A9                       ntfs       
    /dev/sdb1        DEA5-3CD8                              vfat       UBUNTU 1204
    
    ================================ Mount points: =================================
    
    Device           Mount_Point              Type       Options
    
    /dev/loop0       /rofs                    squashfs   (ro,noatime)
    /dev/sdb1        /cdrom                   vfat       (ro,noatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
    
    
    =========================== sdb1/boot/grub/grub.cfg: ===========================
    
    --------------------------------------------------------------------------------
    
    if loadfont /boot/grub/font.pf2 ; then
        set gfxmode=auto
        insmod efi_gop
        insmod efi_uga
        insmod gfxterm
        terminal_output gfxterm
    fi
    
    set menu_color_normal=white/black
    set menu_color_highlight=black/light-gray
    
    menuentry "Try Ubuntu without installing" {
        set gfxpayload=keep
        linux    /casper/vmlinuz.efi  file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash --
        initrd    /casper/initrd.lz
    }
    menuentry "Install Ubuntu" {
        set gfxpayload=keep
        linux    /casper/vmlinuz.efi  file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash --
        initrd    /casper/initrd.lz
    }
    menuentry "Check disc for defects" {
        set gfxpayload=keep
        linux    /casper/vmlinuz.efi  boot=casper integrity-check quiet splash --
        initrd    /casper/initrd.lz
    }
    --------------------------------------------------------------------------------
    
    ============================== sdb1/syslinux.cfg: ==============================
    
    --------------------------------------------------------------------------------
    DEFAULT loadconfig 
     
    LABEL loadconfig 
      CONFIG /isolinux/isolinux.cfg 
      APPEND /isolinux/ 
    --------------------------------------------------------------------------------
    
    =================== sdb1: Location of files loaded by Grub: ====================
    
               GiB - GB             File                                 Fragment(s)
    
                ?? = ??             boot/grub/grub.cfg                             1
    
    ================= sdb1: Location of files loaded by Syslinux: ==================
    
               GiB - GB             File                                 Fragment(s)
    
                ?? = ??             ldlinux.sys                                    1
                ?? = ??             syslinux.cfg                                   1
    As you can see sda1 and sda2 exists but the installer doesn't find them

    Thank you for any help you can provide me.
    Last edited by skyglow; September 9th, 2013 at 09:32 PM.

  2. #2
    Join Date
    Aug 2007
    Location
    a puddle in Manchester
    Beans
    9,206
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Ubuntu 12.04.3 installer can't see previous partitions but gparted does

    Welcome to UF.
    It seems that your hard drive has the remnants of a GUID partition table which could be confusing the installer. When both MBR data and GPT data are on the same disc installers can get confused and report no partitions.
    If you are happy using the MBR partitions I would recommend that you remove the stray GPT data on the disc. There are a few ways to do that, one of which is to download and run Fixparts (a utility written by a former member of this forum).
    Once Fixparts has run I suspect you'll find that the installer behaves normally.

    Download Fixparts for your architecture (32 bit or 64 bit) either in Windows format or Linux (.deb) format and run it following the instructions below
    http://www.rodsbooks.com/fixparts/
    MacBook Pro 10,1 retina

  3. #3
    Join Date
    Feb 2011
    Beans
    11

    Re: [SOLVED]Ubuntu 12.04.3 installer can't see previous partitions but gparted does

    Problem was exactly what you said.
    Only thing that differs from the guide is sfdisk supports only MBR and not GPT.
    Thanks again for your support.
    I already marked this topic as solved and i think it's possible to close

  4. #4
    Join Date
    Aug 2007
    Location
    a puddle in Manchester
    Beans
    9,206
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: [SOLVED]Ubuntu 12.04.3 installer can't see previous partitions but gparted does

    Yes, that's correct. If I remember correctly Rod states that in the guide.
    I'm glad it was solved so easily. It's a very handy little utility, Fixparts. You hope you don't need it but you're glad it's there if you do.
    Happy Ubuntuing!
    MacBook Pro 10,1 retina

  5. #5
    Join Date
    Feb 2011
    Beans
    256

    Re: [SOLVED]Ubuntu 12.04.3 installer can't see previous partitions but gparted does

    Fixparts is for MBR/BIOS/Legacy/CSM system. Which is what Quackers recommends to use as skyglow indicates the intention of staying with MBR.

    If you want to go with GPT and UEFI (Ubuntu has ability to install to GPT using MBR or UEFI) you could use gdisk to fix partition table and or efibootmgr to delete unused UEFI boot entries
    GPT fdisk consists of three programs:

    • gdisk—An interactive text-mode program similar to fdisk
    • sgdisk—A command-line program intended for use in scripts or by experts who need quick and direct access to a specific feature
    • cgdisk—A curses-based interactive text-mode program similar to cfdisk
    Fixparts comes with these utilities.
    Source: http://www.rodsbooks.com/gdisk/walkthrough.html

    whereas sfdisk is for MBR (as described)
    sfdisk doesn't understand the GUID Partition Table (GPT) format and it
    is not designed for large partitions. In these cases use the more
    advanced GNU parted(8).
    Source: http://manpages.ubuntu.com/manpages/.../sfdisk.8.html

    For more information regarding why and how what skyglow observes see http://www.rodsbooks.com/gdisk/whygdisk.html

    Nice one Quackers.
    The difference between knowledge and wisdom is knowing what to do or just doing it. I know nothing and get little done.

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