[SOLVED] no grub/defaults/grub to edit on triole-boot system
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Thank You Larry for all of your info, at the time I didn't know which grub was default, now I do.
I had lost my Grub in Ubuntu. Was trying to recover without reinstalling os. I ended-up reinstalling Ubuntu
upgrading kernel in Debian so as to be able to read Ubuntu's fs.
This is my grub conf:
PHP Code:
# # DO NOT EDIT THIS FILE # # It is automatically generated by grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub #
### BEGIN /etc/grub.d/00_header ### if [ -s $prefix/grubenv ]; then set have_grubenv=true load_env fi set default="0" if [ "${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 "${boot_once}" ]; then save_env recordfail; fi; fi }
function load_video { insmod vbe insmod vga }
insmod part_msdos insmod ext2 set root='(hd1,msdos1)' search --no-floppy --fs-uuid --set 95e3847b-3b31-4577-9055-e04187ce5e51 if loadfont /usr/share/grub/unicode.pf2 ; then set gfxmode=640x480 load_video insmod gfxterm fi terminal_output gfxterm insmod part_msdos insmod ext2 set root='(hd1,msdos1)' search --no-floppy --fs-uuid --set 95e3847b-3b31-4577-9055-e04187ce5e51 set locale_dir=($root)/boot/grub/locale set lang=en insmod gettext if [ "${recordfail}" = 1 ]; then set timeout=-1 else set timeout=10 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 ### END /etc/grub.d/05_debian_theme ###
### BEGIN /etc/grub.d/10_linux ### menuentry 'Ubuntu, with Linux 2.6.35-22-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 set root='(hd1,msdos1)' search --no-floppy --fs-uuid --set 95e3847b-3b31-4577-9055-e04187ce5e51 linux /boot/vmlinuz-2.6.35-22-generic root=UUID=95e3847b-3b31-4577-9055-e04187ce5e51 ro quiet splash initrd /boot/initrd.img-2.6.35-22-generic } menuentry 'Ubuntu, with Linux 2.6.35-22-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 set root='(hd1,msdos1)' search --no-floppy --fs-uuid --set 95e3847b-3b31-4577-9055-e04187ce5e51 echo 'Loading Linux 2.6.35-22-generic ...' linux /boot/vmlinuz-2.6.35-22-generic root=UUID=95e3847b-3b31-4577-9055-e04187ce5e51 ro single echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-2.6.35-22-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,msdos1)' search --no-floppy --fs-uuid --set 95e3847b-3b31-4577-9055-e04187ce5e51 linux16 /boot/memtest86+.bin } menuentry "Memory test (memtest86+, serial console 115200)" { insmod part_msdos insmod ext2 set root='(hd1,msdos1)' search --no-floppy --fs-uuid --set 95e3847b-3b31-4577-9055-e04187ce5e51 linux16 /boot/memtest86+.bin console=ttyS0,115200n8 } ### END /etc/grub.d/20_memtest86+ ###
### BEGIN /etc/grub.d/30_os-prober ### menuentry "Debian GNU/Linux, linux 2.6.32-bpo.5-686 (on /dev/sda1)" { insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set 5c1d78f5-f165-441f-ba75-94b30cdd4a38 linux /boot/vmlinuz-2.6.32-bpo.5-686 root=UUID=5c1d78f5-f165-441f-ba75-94b30cdd4a38 ro initrd /boot/initrd.img-2.6.32-bpo.5-686 } menuentry "Debian GNU/Linux, linux 2.6.32-bpo.5-686 (single-user mode) (on /dev/sda1)" { insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set 5c1d78f5-f165-441f-ba75-94b30cdd4a38 linux /boot/vmlinuz-2.6.32-bpo.5-686 root=UUID=5c1d78f5-f165-441f-ba75-94b30cdd4a38 ro single initrd /boot/initrd.img-2.6.32-bpo.5-686 } menuentry "Debian GNU/Linux, linux 2.6.26-2-686 (on /dev/sda1)" { insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set 5c1d78f5-f165-441f-ba75-94b30cdd4a38 linux /boot/vmlinuz-2.6.26-2-686 root=UUID=5c1d78f5-f165-441f-ba75-94b30cdd4a38 ro initrd /boot/initrd.img-2.6.26-2-686 } menuentry "Debian GNU/Linux, linux 2.6.26-2-686 (single-user mode) (on /dev/sda1)" { insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set 5c1d78f5-f165-441f-ba75-94b30cdd4a38 linux /boot/vmlinuz-2.6.26-2-686 root=UUID=5c1d78f5-f165-441f-ba75-94b30cdd4a38 ro single initrd /boot/initrd.img-2.6.26-2-686 } menuentry "Microsoft Windows XP Professional (on /dev/sda3)" { insmod part_msdos insmod fat set root='(hd0,msdos3)' search --no-floppy --fs-uuid --set 588c-308a drivemap -s (hd0) ${root} chainloader +1 } ### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ### # This file provides an easy way to add custom menu entries. Simply type the # menu entries you want to add after this comment. Be careful not to change # the 'exec tail' line above. ### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ### if [ -f $prefix/custom.cfg ]; then source $prefix/custom.cfg; fi ### END /etc/grub.d/41_custom ###
What I really want to learn is to be able to control or restore grub without reinstalling the os.
I guess that will be right after I get the ins and outs of the existing grub.
1. There's grub legacy in debian, ? in winsxp, grub2 in Ubuntu. where did grub2 go? It's menu is not in debian.
2. How do I find it or should I just change the grub that is within Debian to Grub2 & make it the system default and it's at the beginning of the system.
At the time of Ubuntu installation I didn't have access to Debian, due to wins install. So wins partition had boot flag.
3. Is there a way to enable grub legacy and add Ubuntu entries to it?
4. Is it as easy as changing the boot flags to Grub in Debian partition at beginning of hda?
5. Why can't I see default grub file on this installation of Ubuntu?
On this 1 as well as the other I have root login and can't see it.
ok so you now know if grub2 is installed and controlling your MBR its config file is called grub.cfg....good solved
2 You can convert back to grub-legacy if you wish....optional stil open
3) So in your preferred linux partition...download grub and install it to MBR and create entries for menu.lst
I assume you are familar with grub-legacy?
4) bootable flag is something windows needs and should be set only once per drive IMHO and you appear to have 2 drives?
so now my questions
A) have you done a speed test on drive 1 versus 2?
If drive 2 is fastest make that the first bootable drive and re-do grub legacy or grub2 to its MBR
B) you can have grub-legacy in MBR with its booting files controlling your menu and chainload to grub2 on some other partition....or have grub2 in MBR with its booting files chainloading to grub-legacy or
one grub or one grub2.....controlling the lot
I have noticed grub2 takes at least two times as long to load as grub legacy so if speed is a priority use legacy on your fastest drive with Debain and chainload ubuntu.
Grub legacy can not read ext4 file system of ubuntu. I gave up and went to grub2. The thing I dis like is grub2 is more complicated than legacy
Older versions of grub legacy can not read ext4. However the one in Ubuntu since about Jaunty can. The one in Fedora 13 can too, and can also boot btrfs, though to do this it has to be in a separate /boot partition.
As aus9 has pointed out, legacy and grub2 can chainload each other. For this to be possible, the boot loader - either one - has to be installed in the superblock of the root partition. I have found it easier to get grub 1 "legacy" into the superblock. With grub2 you have to use the --force option, and even then it hasn't always worked for me. So IMHO it's easiest to put grub 2 into the MBR, pointing to your "main" distribution (ie, let that distro install Grub2 to the MBR when you install), and for the others, don't let them overwrite the MBR; if they won't put grub x into the root partition, install without a boot loader, and manually install grub1 later. For chainloading you will need a file/etc/grub.d/xx_custom where xx is a two digit number, if it is below 30 then it will load before /etc/grub.d/30_os-prober, which is convenient.
The file should start like:
Quote:
#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry "Ubuntu 10.04 Lucid in sda1" {
set root=(hd0,1)
chainloader +1
}
menuentry "Xubuntu 9.10 in sda5" {
set root=(hd0,5)
chainloader +1
}
and continue for as many entries as you need.
Saikee's Just booting tips Never leave home without it!
There is also a thread on the Ubuntu forum for tweaking grub2, which is useful for getting rid of the verbiage.
Older versions of grub legacy can not read ext4. However the one in Ubuntu since about Jaunty can. The one in Fedora 13 can too, and can also boot btrfs, though to do this it has to be in a separate /boot partition.
I changed my 2.6.26 Debian kernel to a 2.6.32 kernel it can read ext4.
Quote:
A) have you done a speed test on drive 1 versus 2?
If drive 2 is fastest make that the first bootable drive and re-do grub legacy or grub2 to its MBR
I have not tested the speed of the drives, never even thought about it & I wasn't aware of speed test.
Quote:
Triple-boot system can't find grub/defaults/grub file. debian lenny on hda2, winsxp hda3, ubuntu10.10 hdb2
Since that day I've since found out that Debian sda1(hd0,1), winsxp sda2(hd0,2) Ubuntu desktop sdb1 (hd1,1) and added
Ubuntu server to sdb6(hd1,6). At the present time all of my os'es have their own grub with entries in the 1 on sdb1. Right now I'm quite comfortable with working with the grub and if lost I can find and almost positive that with a quick os-probe and update I can get access to all the other os'es.
Right now I'm working on getting Ubuntu to shutdown without pressing the button.
Impert thanks for the chainloading information, I still have more to learn on it but it's all helpful.
Larry I'm going to mark this 1 as solved, and to be continued on next thread when I get ready to install with 1 grub with multiple os'es.
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