08-31-2006
It's probably
replacing your grub.conf instead of
adding to it, so it forgets how to boot the previous OS.
You'll need to keep a copy of your grub.conf before installation, and re-add the relevant settings when something inevitably overwrites it, or worse, changes what partition grub looks for grub.conf in! That's why it's best to have a seperate /boot/, easier to keep track of what's booting from what, where.
Also, I don't understand your statement:
Quote:
1st installation of RedHat is succesful, but when it comes to 2nd installation of Fedora, it fails. It seems that they doesnt support the /, /usr/, /var etc to be cross platform.
Are you trying to make them all use the same /usr/, /var/, and so forth? Nono, give them their own!
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LEARN ABOUT LINUX
grub-mkimage
GRUB-MKIMAGE(1) User Commands GRUB-MKIMAGE(1)
NAME
grub-mkimage - make a bootable image of GRUB
SYNOPSIS
grub-mkimage [OPTION]... [MODULES]
DESCRIPTION
Make a bootable image of GRUB.
-d, --directory=DIR
use images and modules under DIR [default=/usr/lib/grub/@platform@]
-p, --prefix=DIR
set grub_prefix directory [default=/boot/grub]
-m, --memdisk=FILE
embed FILE as a memdisk image
-c, --config=FILE
embed FILE as boot config
-n, --note
add NOTE segment for CHRP Open Firmware
-o, --output=FILE
output a generated image to FILE [default=stdout]
-O, --format=FORMAT
generate an image in format available formats: i386-coreboot, i386-multiboot, i386-pc, i386-pc-pxe, i386-efi, i386-ieee1275,
i386-qemu, x86_64-efi, mipsel-yeeloong-flash, mipsel-yeeloong-elf, powerpc-ieee1275, sparc64-ieee1275-raw, sparc64-ieee1275-aout
-C, --compression=(xz|none|auto)
choose the compression to use
-h, --help
display this message and exit
-V, --version
print version information and exit
-v, --verbose
print verbose messages
REPORTING BUGS
Report bugs to <bug-grub@gnu.org>.
SEE ALSO
grub-install(8), grub-setup(8), grub-mkrescue(1), grub-mknetdir(8)
The full documentation for grub-mkimage is maintained as a Texinfo manual. If the info and grub-mkimage programs are properly installed at
your site, the command
info grub-mkimage
should give you access to the complete manual.
grub-mkimage (GRUB) 1.99-12ubuntu5 October 2011 GRUB-MKIMAGE(1)