Arch Linux

fygar256

Member

From: Japan

Registered: 2023-03-03

Posts: 43

Website

[SOLVED] os-prober won't work for mbr partitioning.

os-prober doesn't work for mbr partitioning.

why?

fdisk -l is as follows:

# LANG=C fdisk -l
Disk /dev/sda: 465.76 GiB, 500107862016 bytes, 976773168 sectors
Disk model: TOSHIBA MQ01ABF0
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xd0f0a1c2

Device     Boot     Start       End   Sectors   Size Id Type
/dev/sda1  *         2048 468750000 468747953 223.5G 83 Linux
/dev/sda3  *    468750336 968404991 499654656 238.3G 83 Linux


Disk /dev/sdd: 28.87 GiB, 31001149440 bytes, 60549120 sectors
Disk model: TransMemory     
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x53551c9d

Device     Boot Start      End  Sectors  Size Id Type
/dev/sdd1          63 60548543 60548481 28.9G  b W95 FAT32


Disk /dev/sde: 58.17 GiB, 62459215872 bytes, 121990656 sectors
Disk model: USB FLASH DRIVE 
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x3166589e

Device     Boot Start       End   Sectors  Size Id Type
/dev/sde1        8064 121990655 121982592 58.2G  c W95 FAT32 (LBA)


Disk /dev/sdc: 931.51 GiB, 1000203804160 bytes, 1953523055 sectors
Disk model: MQ01ABD100      
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x000c9924

Device     Boot      Start        End    Sectors   Size Id Type
/dev/sdc1  *          2048 1156493311 1156491264 551.5G 83 Linux
/dev/sdc2       1156493312 1953521663  797028352 380.1G 83 Linux

grub-mkconfig outputs this:

# LANG=C grub-mkconfig -o /boot/grub/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-linux-lts
Found initrd image: /boot/intel-ucode.img /boot/initramfs-linux-lts.img
Found fallback initrd image(s) in /boot:  intel-ucode.img initramfs-linux-lts-fallback.img
Found linux image: /boot/vmlinuz-linux
Found initrd image: /boot/intel-ucode.img /boot/initramfs-linux.img
Found fallback initrd image(s) in /boot:  intel-ucode.img initramfs-linux-fallback.img
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Adding boot menu entry for UEFI Firmware Settings ...
done

os-prober outputs nothing:

# os-prober
# 

grub configuration is as follows:

# cat /etc/default/grub
# GRUB boot loader configuration

GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="Arch"
GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3"
GRUB_CMDLINE_LINUX=""

# Preload both GPT and MBR modules so that they are not missed
GRUB_PRELOAD_MODULES="part_gpt part_msdos"

# Uncomment to enable booting from LUKS encrypted devices
#GRUB_ENABLE_CRYPTODISK=y

# Set to 'countdown' or 'hidden' to change timeout behavior,
# press ESC key to display menu.
GRUB_TIMEOUT_STYLE=menu

# Uncomment to use basic console
GRUB_TERMINAL_INPUT=console

# Uncomment to disable graphical terminal
#GRUB_TERMINAL_OUTPUT=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `videoinfo'
GRUB_GFXMODE=auto

# Uncomment to allow the kernel use the same resolution used by grub
GRUB_GFXPAYLOAD_LINUX=keep

# Uncomment if you want GRUB to pass to the Linux kernel the old parameter
# format "root=/dev/xxx" instead of "root=/dev/disk/by-uuid/xxx"
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
GRUB_DISABLE_RECOVERY=true

# Uncomment and set to the desired menu colors.  Used by normal and wallpaper
# modes only.  Entries specified as foreground/background.
#GRUB_COLOR_NORMAL="light-blue/black"
#GRUB_COLOR_HIGHLIGHT="light-cyan/blue"

# Uncomment one of them for the gfx desired, a image background or a gfxtheme
#GRUB_BACKGROUND="/path/to/wallpaper"
#GRUB_THEME="/path/to/gfxtheme"

# Uncomment to get a beep at GRUB start
#GRUB_INIT_TUNE="480 440 1"

# Uncomment to make GRUB remember the last selection. This requires
# setting 'GRUB_DEFAULT=saved' above.
#GRUB_SAVEDEFAULT=true

# Uncomment to disable submenus in boot menu
#GRUB_DISABLE_SUBMENU=y

# Probing for other operating systems is disabled for security reasons. Read
# documentation on GRUB_DISABLE_OS_PROBER, if still want to enable this
# functionality install os-prober and uncomment to detect and include other
# operating systems.
GRUB_DISABLE_OS_PROBER=false
GRUB_OS_PROBER_SKIP_LIST=""

my hdd have only mbr partitioning and no uefi.
please tell me how os-prober detect the other os than arch linux.

arch linux is in sda3 and ubuntu linux is in sda1.

regards.

Last edited by fygar256 (2023-03-10 06:33:09)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,255

Re: [SOLVED] os-prober won't work for mbr partitioning.

You need to mount the partitions of the other systems that contain the bootable bits before running os-prober as it relies on your mtab for knowing which paths to check. The exact mount point doesn't matter, you just have to have it mounted.

fygar256

Member

From: Japan

Registered: 2023-03-03

Posts: 43

Website

Re: [SOLVED] os-prober won't work for mbr partitioning.

Surely it works.  i had to need to mount the partition. Thank you.