Setup: Dual boot, Windows 7 and Ubuntu 14.04. 'Boot info summary' shown below.
Issue: I installed Ubuntu 14.04 (Trusty) and then updated software. On reboot, the boot sequence exits to grub rescue terminal and reports error: "error: no such device... Entering rescue mode... grub rescue>"
If I reboot, enter the BIOS menu and then "exit and disgard any changes", then (instead of hanging) the Grub2 menu appears (!) and can then login normally to Ubuntu (or Windows.) Can also use Boot Repair Live CD to fix it. However, on reboot the same issue arises. So whilst there is a temporary workaround, it is a rubbish solution and belies future problems with updates. Had 5 days of reboots. Please help newbie.
Note: Root=sdb5. Boot locations sda1 & sdb1. Bootscrip log identifies wubildr and wubildr.mbr in sda2/sdb2 (mbr/boots). There is a wubildr file in the C: drive 'though (although not an executable/binary).
Question: Is the error due to an issue with 'mounting of devices', dual-boot/wubi/mbr, 'boot location' or other issue? If so, how to fix? Will upgrade to 15.04 / 16.04 help? I can't be the first person to have this issue, perhaps you can forward a link to an existing solution.
History: Ubuntu is not installed on Windows, probably was before (can't remember.) PC created with Win7 / Ubuntu (12.04) dual boot. Changing partitions bricked Ubuntu. So, Ubuntu partition re-formatted, and re-installed using Ubuntu 14.04 Live CD. Grub2 issues encountered. "bootrec/fixmbr" && "bootrec/fixboot" have been utilised, using Windows Repair Live CD, to fix mbr. Boot Repair Live CD used to repair Grub2.
Note: NVIDIA NVS300 graphics card installed & dual display works. Also, GeForce GTX 970 graphics card installed for Cuda parallel processing.
Boot Info Script 0.61 [1 April 2012]
============================= Boot Info Summary: ===============================
=> Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of
the same hard drive for core.img. core.img is at this location and looks
in partition 112 for .
=> Grub2 (v1.99) is installed in the MBR of /dev/sdb and looks at sector 1 of
the same hard drive for core.img. core.img is at this location and looks
in partition 112 for .
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: /bootmgr /Boot/BCD /Windows/System32/winload.exe
/wubildr /wubildr.mbr
sdb1: __________________________________________________________________________
File system: ntfs
Boot sector type: Grub2 (v1.99)
Boot sector info: Grub2 (v1.99) is installed in the boot sector of sdb1
and looks at sector 1795665720 of the same hard drive
for core.img. core.img is at this location and looks
in partition 112 for . No errors found in the Boot
Parameter Block.
Operating System:
Boot files:
sdb2: __________________________________________________________________________
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: /wubildr
sdb3: __________________________________________________________________________
File system: Extended Partition
Boot sector type: -
Boot sector info:
sdb5: __________________________________________________________________________
File system: ext4
Boot sector type: -
Boot sector info:
Operating System: Ubuntu 14.04.5 LTS
Boot files: /boot/grub/grub.cfg /etc/fstab
sdb6: __________________________________________________________________________
File system:
Boot sector type: -
Boot sector info:
Mounting failed: mount: unknown filesystem type ''
============================ Drive/Partition Info: =============================
Drive: sda _____________________________________________________________________
Disk /dev/sda: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders, total 234441648 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/sda1 * 2,048 206,847 204,800 7 NTFS / exFAT / HPFS
/dev/sda2 206,848 234,438,655 234,231,808 7 NTFS / exFAT / HPFS
Drive: sdb _____________________________________________________________________
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 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/sdb1 * 2,048 1,677,723,647 1,677,721,600 7 NTFS / exFAT / HPFS
/dev/sdb2 1,843,202,048 1,953,519,615 110,317,568 7 NTFS / exFAT / HPFS
/dev/sdb3 1,677,725,694 1,843,202,047 165,476,354 5 Extended
/dev/sdb5 1,677,725,696 1,809,750,015 132,024,320 83 Linux
/dev/sdb6 1,809,752,064 1,843,202,047 33,449,984 82 Linux swap / Solaris
"blkid" output: ________________________________________________________________
Device UUID TYPE LABEL
/dev/sda1 4C56283856282564 ntfs System Reserved
/dev/sda2 9A2C2C492C2C22AD ntfs
/dev/sdb1 26BE725CBE722509 ntfs Storage
/dev/sdb2 06DCACD5DCACC073 ntfs Backup
/dev/sdb5 27bd3aa5-7686-446e-93d4-4e82f609d707 ext4
================================ Mount points: =================================
Device Mount_Point Type Options
/dev/sdb5 / ext4 (rw,errors=remount-ro)
=========================== sdb5/boot/grub/grub.cfg: ===========================
#
#
#
BEGIN /etc/grub.d/00_header
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
else
set default="0"
fi
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function recordfail {
set recordfail=1
if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
}
if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos5 --hint-efi=hd1,msdos5 --hint-baremetal=ahci1,msdos5 27bd3aa5-7686-446e-93d4-4e82f609d707
else
search --no-floppy --fs-uuid --set=root 27bd3aa5-7686-446e-93d4-4e82f609d707
fi
font="/usr/share/grub/unicode.pf2"
fi
if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_GB
insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ] ; then
set timeout=30
else
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=10
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=10
fi
fi
END /etc/grub.d/00_header
BEGIN /etc/grub.d/05_debian_theme
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
if background_color 44,0,30,0; then
clear
fi
END /etc/grub.d/05_debian_theme
BEGIN /etc/grub.d/10_linux
function gfxmode {
set gfxpayload="${1}"
if [ "${1}" = "keep" ]; then
set vt_handoff=vt.handoff=7
else
set vt_handoff=
fi
}
if [ "${recordfail}" != 1 ]; then
if [ -e ${prefix}/gfxblacklist.txt ]; then
if hwmatch ${prefix}/gfxblacklist.txt 3; then
if [ ${match} = 0 ]; then
set linux_gfx_mode=keep
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=keep
fi
else
set linux_gfx_mode=text
fi
export linux_gfx_mode
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-27bd3aa5-7686-446e-93d4-4e82f609d707' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos5 --hint-efi=hd1,msdos5 --hint-baremetal=ahci1,msdos5 27bd3aa5-7686-446e-93d4-4e82f609d707
else
search --no-floppy --fs-uuid --set=root 27bd3aa5-7686-446e-93d4-4e82f609d707
fi
linux /boot/vmlinuz-3.13.0-93-generic root=UUID=27bd3aa5-7686-446e-93d4-4e82f609d707 ro quiet splash $vt_handoff
initrd /boot/initrd.img-3.13.0-93-generic
}
submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-27bd3aa5-7686-446e-93d4-4e82f609d707' {
menuentry 'Ubuntu, with Linux 3.13.0-93-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.13.0-93-generic-advanced-27bd3aa5-7686-446e-93d4-4e82f609d707' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos5 --hint-efi=hd1,msdos5 --hint-baremetal=ahci1,msdos5 27bd3aa5-7686-446e-93d4-4e82f609d707
else
search --no-floppy --fs-uuid --set=root 27bd3aa5-7686-446e-93d4-4e82f609d707
fi
echo 'Loading Linux 3.13.0-93-generic ...'
linux /boot/vmlinuz-3.13.0-93-generic root=UUID=27bd3aa5-7686-446e-93d4-4e82f609d707 ro quiet splash $vt_handoff
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.13.0-93-generic
}
menuentry 'Ubuntu, with Linux 3.13.0-93-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.13.0-93-generic-recovery-27bd3aa5-7686-446e-93d4-4e82f609d707' {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos5 --hint-efi=hd1,msdos5 --hint-baremetal=ahci1,msdos5 27bd3aa5-7686-446e-93d4-4e82f609d707
else
search --no-floppy --fs-uuid --set=root 27bd3aa5-7686-446e-93d4-4e82f609d707
fi
echo 'Loading Linux 3.13.0-93-generic ...'
linux /boot/vmlinuz-3.13.0-93-generic root=UUID=27bd3aa5-7686-446e-93d4-4e82f609d707 ro recovery nomodeset
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.13.0-93-generic
}
menuentry 'Ubuntu, with Linux 3.13.0-24-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.13.0-24-generic-advanced-27bd3aa5-7686-446e-93d4-4e82f609d707' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos5 --hint-efi=hd1,msdos5 --hint-baremetal=ahci1,msdos5 27bd3aa5-7686-446e-93d4-4e82f609d707
else
search --no-floppy --fs-uuid --set=root 27bd3aa5-7686-446e-93d4-4e82f609d707
fi
echo 'Loading Linux 3.13.0-24-generic ...'
linux /boot/vmlinuz-3.13.0-24-generic root=UUID=27bd3aa5-7686-446e-93d4-4e82f609d707 ro quiet splash $vt_handoff
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.13.0-24-generic
}
menuentry 'Ubuntu, with Linux 3.13.0-24-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.13.0-24-generic-recovery-27bd3aa5-7686-446e-93d4-4e82f609d707' {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos5 --hint-efi=hd1,msdos5 --hint-baremetal=ahci1,msdos5 27bd3aa5-7686-446e-93d4-4e82f609d707
else
search --no-floppy --fs-uuid --set=root 27bd3aa5-7686-446e-93d4-4e82f609d707
fi
echo 'Loading Linux 3.13.0-24-generic ...'
linux /boot/vmlinuz-3.13.0-24-generic root=UUID=27bd3aa5-7686-446e-93d4-4e82f609d707 ro recovery nomodeset
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.13.0-24-generic
}
}
END /etc/grub.d/10_linux
BEGIN /etc/grub.d/20_linux_xen
END /etc/grub.d/20_linux_xen
BEGIN /etc/grub.d/20_memtest86+
menuentry 'Memory test (memtest86+)' {
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos5 --hint-efi=hd1,msdos5 --hint-baremetal=ahci1,msdos5 27bd3aa5-7686-446e-93d4-4e82f609d707
else
search --no-floppy --fs-uuid --set=root 27bd3aa5-7686-446e-93d4-4e82f609d707
fi
knetbsd /boot/memtest86+.elf
}
menuentry 'Memory test (memtest86+, serial console 115200)' {
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos5 --hint-efi=hd1,msdos5 --hint-baremetal=ahci1,msdos5 27bd3aa5-7686-446e-93d4-4e82f609d707
else
search --no-floppy --fs-uuid --set=root 27bd3aa5-7686-446e-93d4-4e82f609d707
fi
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
END /etc/grub.d/20_memtest86+
BEGIN /etc/grub.d/30_os-prober
menuentry 'Windows 7 (loader) (on /dev/sda1)' --class windows --class os $menuentry_id_option 'osprober-chain-4C56283856282564' {
insmod part_msdos
insmod ntfs
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 4C56283856282564
else
search --no-floppy --fs-uuid --set=root 4C56283856282564
fi
parttool ${root} hidden-
chainloader +1
}
menuentry 'Windows 7 (loader) (on /dev/sda2)' --class windows --class os $menuentry_id_option 'osprober-chain-9A2C2C492C2C22AD' {
insmod part_msdos
insmod ntfs
set root='hd0,msdos2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2 9A2C2C492C2C22AD
else
search --no-floppy --fs-uuid --set=root 9A2C2C492C2C22AD
fi
parttool ${root} hidden-
chainloader +1
}
set timeout_style=menu
if [ "${timeout}" = 0 ]; then
set timeout=10
fi
END /etc/grub.d/30_os-prober
BEGIN /etc/grub.d/30_uefi-firmware
END /etc/grub.d/30_uefi-firmware
BEGIN /etc/grub.d/40_custom
END /etc/grub.d/40_custom
BEGIN /etc/grub.d/40_custom.save
END /etc/grub.d/40_custom.save
BEGIN /etc/grub.d/41_custom
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
=============================== sdb5/etc/fstab: ================================
#
#
UUID=27bd3aa5-7686-446e-93d4-4e82f609d707 / ext4 errors=remount-ro 0 1
/dev/mapper/cryptswap1 none swap sw 0 0
=================== sdb5: Location of files loaded by Grub: ====================
GiB - GB File Fragment(s)
=============================== StdErr Messages: ===============================
cat: /tmp/BootInfo-Hy9WmV4t/Tmp_Log: No such file or directory
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