Explore linux's booting messages

pan64 · 05-11-2016, 11:48 AM

I have a grub boot menu and there is an option to boot into recovery mode.

rocket42 · 05-12-2016, 01:21 AM

Quote:

Originally Posted by pan64

I have a grub boot menu and there is an option to boot into recovery mode.

can you post grub boot menu,please?

pan64 · 05-12-2016, 01:48 AM

I do not think you can use my grub config, you need to generate your own one. how did you install your boot loader?

rocket42 · 05-12-2016, 03:09 AM

Quote:

Originally Posted by pan64

I do not think you can use my grub config, you need to generate your own one. how did you install your boot loader?

Oh, no, i don't use your grub config. I only want to consult it.
i use:

Code:

grub-bios-setup -b boot.img -c grub.img -d . /dev/sdb

it automatically created grub.cfg in boot/grub/ folder. it have only one menu which to load kernel.

pan64 · 05-12-2016, 03:16 AM

so here are the relevant entries in grub.cfg:

Code:

        menuentry 'Ubuntu, with Linux 3.13.0-79-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.13.0-79-generic-advanced-f3d07eb2-b622-406
                recordfail
                load_video
                gfxmode $linux_gfx_mode
                insmod gzio
                insmod part_msdos
                insmod ext2
                set root='hd0,msdos1'
                if [ x$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  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                else
                  search --no-floppy --fs-uuid --set=root xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                fi
                echo    'Loading Linux 3.13.0-79-generic ...'
                linux   /vmlinuz-3.13.0-79-generic root=/dev/mapper/my_vg-root ro  quiet splash $vt_handoff
                echo    'Loading initial ramdisk ...'
                initrd  /initrd.img-3.13.0-79-generic
        }
        menuentry 'Ubuntu, with Linux 3.13.0-79-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.13.0-79-generic-recovery-f
                recordfail
                load_video
                insmod gzio
                insmod part_msdos
                insmod ext2
                set root='hd0,msdos1'
                if [ x$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  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                else
                  search --no-floppy --fs-uuid --set=root xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                fi
                echo    'Loading Linux 3.13.0-79-generic ...'
                linux   /vmlinuz-3.13.0-79-generic root=/dev/mapper/my_vg-root ro recovery nomodeset 
                echo    'Loading initial ramdisk ...'
                initrd  /initrd.img-3.13.0-79-generic

you may try to modify kernel parameters during boot and enter recovery mode

rocket42 · 05-12-2016, 03:33 AM

your grub config is quite same as ubuntu 14.04LTS's one. I am using this os.
i reviewed list of kernel parameters. no one is recovery
also i checked options in kernel setting. i don't see which options is for recovery