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rated 0 times [  2] [ 0]  / answers: 1 / hits: 3027  / 2 Years ago, sat, february 12, 2022, 2:03:41

I have installed ubuntu using wubi and want to create a boot can I do this without downloading the iso file....

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The live CD is usually created with a filesystem called squashfs. Squashfs is read only compressed filesystem that allow us to squeeze our system into a single CD. Note that your system has to be about 2GB (this might need some trial an error) to produce a compressed image that fits on the CD. Otherwise, you will have to use a DVD

Creating a live CD from an existing/new installation

Follow the procedure to create a live cd from your current installation.

  1. Set up some variables:

    export WORK=~/temp
    export CD=~/livecd
    export FORMAT=squashfs
    export FS_DIR=casper

    Replace ~/temp with a path to a temporary
    directory in which we will work in.
    Replace ~/livecd with a path to the
    CD tree.

  2. Make the folder structure.

    sudo mkdir -p ${CD}/{${FS_DIR},boot/grub} ${WORK}/rootfs

  3. Now we will need to install some packages:

    sudo apt-get update && sudo apt-get install grub2 xorriso squashfs-tools

  4. Now we will copy the current installation, modify the exclude flags to fit your needs:

    sudo rsync -av --one-file-system --exclude=/proc/* --exclude=/dev/* 
    --exclude=/sys/* --exclude=/tmp/* --exclude=/home/* --exclude=/lost+found
    --exclude=/var/tmp/* --exclude=/boot/grub/* --exclude=/root/*
    --exclude=/var/mail/* --exclude=/var/spool/* --exclude=${WORK}/rootfs
    --exclude=/etc/fstab --exclude=/etc/mtab --exclude=/etc/hosts
    --exclude=/etc/timezone --exclude=/etc/shadow* --exclude=/etc/gshadow*
    --exclude=/etc/X11/xorg.conf* --exclude=/etc/gdm/custom.conf
    / ${WORK}/rootfs

Note -If you have a separate boot partition, execute this: sudo cp -av /boot/* ${WORK}/rootfs/boot

Note-If you want to copy settings and some files from the home directory then First, define what directories we want to copy:

CONFIG='.config .gconf Desktop "some-other-folder" "and-another-folder"'
And now we copy that:

    cd ~ && for i in $CONFIG
sudo cp -rpv --parents $i ${WORK}/rootfs/etc/skel

Nautilus stores its settings in a directory called .config in the home directory, so I added .config to the variable $CONFIG:

  1. Now we chroot into the new system and modify it.

    sudo mount  --bind /dev/ ${WORK}/rootfs/dev
    sudo mount -t proc proc ${WORK}/rootfs/proc
    sudo mount -t sysfs sysfs ${WORK}/rootfs/sys
    sudo mount -t devpts devpts ${WORK}/rootfs/dev/pts
    sudo chroot ${WORK}/rootfs /bin/bash

    The next commands are done in chroot:

    apt-get update
    apt-get install casper

    Casper contains live scripts.
    If you want an installer too, run this:

    apt-get install ubiquity ubiquity-frontend-gtk

    Or if you want KDE:

    apt-get install ubiquity ubiquity-frontend-kde

  2. Update modules.dep and initramfs:

    depmod -a $(uname -r)
    update-initramfs -u -k $(uname -r)

  3. Remove non-system users - do not worry, we have copied the settings and data into the "skeleton" of users. That means all new users will have them.

    for i in `cat /etc/passwd | awk -F":" '{print $1}'`
    uid=`cat /etc/passwd | grep "^${i}:" | awk -F":" '{print $3}'`
    [ "$uid" -gt "999" -a "$uid" -ne "65534" ] && userdel --force ${i} 2>/dev/null

  4. Clean up:

    apt-get clean
    find /var/log -regex '.*?[0-9].*?' -exec rm -v {} ;
    find /var/log -type f | while read file
    cat /dev/null | tee $file
    rm /etc/resolv.conf /etc/hostname

  5. Exit chroot. exit

  6. Now, we copy the kernel:

    export kversion=`cd ${WORK}/rootfs/boot && ls -1 vmlinuz-* | tail -1 | sed 's@vmlinuz-@@'`
    sudo cp -vp ${WORK}/rootfs/boot/vmlinuz-${kversion} ${CD}/boot/vmlinuz
    sudo cp -vp ${WORK}/rootfs/boot/initrd.img-${kversion} ${CD}/boot/initrd.img
    sudo cp -vp ${WORK}/rootfs/boot/memtest86+.bin ${CD}/boot

  7. If you have installed the installer, you will need to do this, so that the installer doesn't install things like casper:

    sudo chroot ${WORK}/rootfs dpkg-query -W --showformat='${Package} ${Version}
    ' | sudo tee ${CD}/${FS_DIR}/filesystem.manifest
    sudo cp -v ${CD}/${FS_DIR}/filesystem.manifest{,-desktop}
    REMOVE='ubiquity casper user-setup os-prober libdebian-installer4'
    for i in $REMOVE
    sudo sed -i "/${i}/d" ${CD}/${FS_DIR}/filesystem.manifest-desktop

  8. Unmount what we have mounted:

    sudo umount ${WORK}/rootfs/proc
    sudo umount ${WORK}/rootfs/sys
    sudo umount ${WORK}/rootfs/dev/pts
    sudo umount ${WORK}/rootfs/dev

  9. Convert to squashfs:

    sudo mksquashfs ${WORK}/rootfs ${CD}/${FS_DIR}/filesystem.${FORMAT}

  10. Make filesystem.size:
    echo -n $(sudo du -s --block-size=1 ${WORK}/rootfs | tail -1 | awk '{print $1}') | sudo tee ${CD}/casper/filesystem.size

  11. And md5: find ${CD} -type f -print0 | xargs -0 md5sum | sed "s@${CD}@.@" | grep -v md5sum.txt |sudo tee ${CD}/md5sum.txt

  12. Now grub.cfg:

    sudo nano ${CD}/boot/grub/grub.cfg

    (replace nano with your fav text editor, it doesn't matter)
    Paste this and save:

    set default="0"
    set timeout=10

    menuentry "Ubuntu GUI" {
    linux /boot/vmlinuz boot=casper quiet splash
    initrd /boot/initrd.img

    menuentry "Ubuntu in safe mode" {
    linux /boot/vmlinuz boot=casper xforcevesa quiet splash
    initrd /boot/initrd.img

    menuentry "Ubuntu CLI" {
    linux /boot/vmlinuz boot=casper textonly quiet splash
    initrd /boot/initrd.img

    menuentry "Ubuntu GUI persistent mode" {
    linux /boot/vmlinuz boot=casper boot=casper persistent quiet splash
    initrd /boot/initrd.img

    menuentry "Ubuntu GUI from RAM" {
    linux /boot/vmlinuz boot=casper nopersistent toram quiet splash
    initrd /boot/initrd.img

    menuentry "Check Disk for Defects" {
    linux /boot/vmlinuz boot=casper integrity-check quiet splash
    initrd /boot/initrd.img

    menuentry "Memory Test" {
    linux16 /boot/memtest86+.bin

    menuentry "Boot from the first hard disk" {
    set root=(hd0)
    chainloader +1

  13. Make the CD/DVD!
    sudo grub-mkrescue -o ~/live-cd.iso ${CD}

  14. Test it using a virtual machine!

All credit goes to capink, because the guide is from here.

I copied it from here and made a few edits

[#38348] Sunday, February 13, 2022, 2 Years  [reply] [flag answer]
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