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Thread: Booting ISO image without CDROM or USB PEN Support

  1. #1
    Join Date
    Feb 2009
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    1

    Booting ISO image without CDROM or USB PEN Support

    I cannot get GRUB to boot the ubuntu v8.10 iso-image that I've copied onto the first partition of old 15gb disc I had lying around, which I've installed as the second harddrive, i.e. grub (hd1,0). I've examined the v8.10 isolinux set up lcoated in /isolinux/textcfg and extracted the following grub menu item :

    title ubtune LiveCD (hdb1)
    root (hd1,0)
    kernel /casper/vmlinuz file=/preseed/ubuntu.seed boot=casper
    initrd /casper/initrd.gz
    boot

    booting fails when it tries to mount the real root partition. From looking in the initrd.gz image, I've found that its failing in 'scripts/casper' stepping through the findlive_fs function therein. I've tried specifying root=/dev/sdb1 with the same results. Also, I've tried converting the partition to syslinux setup (aka USB pendrive solns) and then chainloaded from GRUB - with the same result ie. can't find the live_fs.

    I could just temporary install a CDROM from another PC, but I'd like the option of keeping this second harddrive partition as a mini easy-installer, eg down an iso, copy to the partition, examine the isolinux cfg and then add option to grub accordingly.

  2. #2
    Join Date
    Feb 2009
    Beans
    1

    Re: Booting ISO image without CDROM or USB PEN Support

    I have a very similar question.

    I have one harddrive with three partitions (A,B,C), of which only one is being used (OS X on partition A). The other two partitions are formatted as fat32 and are empty. I would like to use OS X to download linux distros and copy them to partition C and then, using a bootable USB flash drive, boot into linux (running from the USB flash drive and RAM) and install the distro image file(s) existing in partition C onto partition B to create a dual boot system (partitions A and B)

    The result would be a dual boot system (OS X and Ubuntu) with a partition available for storage of future linux distros.

    I have neither an internal or an external DVD ROM, nor a USB flash drive large enough to store the Ubuntu Live CD. (Hence my question) I am able to boot from a small (512MB) USB flash drive into Puppy Linux 4.10 and see the three partitions on the harddrive.

    So the question is: How to install a local copy of Ubuntu 8.10 to a second partition using a "small" USB flash drive bootable to linux?

    From browsing the internet. I know there are many out there buying external DVD drives and large USB flash drives to accomplish the same result. A satisfactory answer to this questions could save us a lot of time, money, and maximize the use of our existing equipment.

    Thanks,
    Member.

  3. #3
    Join Date
    May 2006
    Location
    Wichita, Kansas
    Beans
    2,967
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Booting ISO image without CDROM or USB PEN Support

    https://help.ubuntu.com/community/In...20installation contains many alternative methods for installing. FYI.

  4. #4
    Join Date
    Mar 2007
    Location
    Here & Now
    Beans
    16,549
    Distro
    Ubuntu 11.04 Natty Narwhal

    Re: Booting ISO image without CDROM or USB PEN Support


    Dr. Fernando Duran Dollenz
    Libertad 584
    6824871

  5. #5
    Join Date
    May 2009
    Location
    New Delhi
    Beans
    372
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Re: Booting ISO image without CDROM or USB PEN Support

    for the live cd
    it may be possible

    Code:
     
    if you can specify the root as 
    kernel /casper/vmlinuz root=/dev/ram0 aufs cdroot=/dev/sda1 looptype=squashfs max_loop=8 loop=/casper/filesystem.squashfs
    initrd /casper/initrd.gz
    what i mean to say is that if you can tell the kernel that the root is a squashfs file not a block
    then it'll work
    this works for gentoo and sabayon but may need a little tweaking for ubuntu

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