Remastering ubuntu 9.04 Jaunty Jackalope

8 comments

1. Thanks for the instructions. Just one thing – in the future, when you are including code, please put them in the pre tag. Otherwise wordpress will change some chars(like “) and it will cause trouble for people who don’t know about the changes.

2. @Binny
   Thanks for the suggestion.

3. Nice howto guide. Thanks a lot.

   3 things:
   The step “cp -r jaunty/root jaunty/remaster” leaves you with jaunty/remaster/root/…”
   There are recurring typos in sources.list (-> soures.list)
   There is an absolute path, while all the others are relative: /jaunty/remaster/etc/apt/

4. another 2 things:
   – the dpkg-query command has a formatting problem. Copy paste does not work for me. Typing by hand works fine.
   – I ended up without a kernel and initramdisk in jaunty/remaster/boot. Guess that it only a detail for everyone else. 😉

5. some more typos… here comes a corrected version:

   Remastering ubuntu 9.04 Jaunty Jackalope

   ( This document was written in connection with a one day ubuntu
   ramastering workshop held at College of Engineering Attingal. See this
   post)

   System Requirement

   You need a reasonably good PC with Ubuntu 9.04 installed. It should
   have plenty of free space ( say 4 GB ) and minimum 1 GB

   Preparing the host system

   apt-get install squashfs-tools
   wget -c … ubuntu-9.04-desktop-i386.iso

   Create a work directory

   # mkdir jaunty

   Create the following sub directoires

   # mkdir jaunty/cdrom
   # mkdir jaunty/tmp
   # mkdir jaunty/root
   # mkdir jaunty/remaster

   Mount the jaunty iso image on jaunty/cdrom directory
   # mount -o loop jaunty.iso jaunty/cdrom

   Copy everything from the cdrom to jaunty/image directory

   # cp -r jaunty/cdrom jaunty/image

   Now the image directory has the content of your cdrom.

   You may refer to this post for an explanation of the contents of the
   image directory.

   Rebuilding the squashfs image.

   We are going to rebuild filesystem.squashfs under jaunty/image/casper

   Move the filesystem.squashfs image to jaunty/tmp directory

   # mv jaunty/image/casper/filesystem.squashfs jaunty/tmp

   Mount the filesystem.squashfs under jaunty/root direct

   # mount -o loop jaunty/tmp/filesystem.squashfs jaunty/root

   Copy the contents of fileystem.squashfs to jaunty/remaster

   # cp -r jaunty/root jaunty/remaster

   Now the jaunty/remaster directory holds the uncompressed root
   filesystem for your live CD.

   Copy resolv.conf and sources.list from the host system

   # cp /etc/resolv.conf jaunty/remaster/etc/

   Preserve original sources.list.

   # cp jaunty/remaster/etc/apt/soures.list jaunty/remaster/etc/apt/soures.list.backup

   #cp /etc/apt/sources.list /jaunty/remaster/etc/apt/

   Make sure that sources.list points to jaunty archive

   Now you can chroot to jaunty/remaster .

   # chroot jaunty/remaster

   Now run the following ( You are inside chroot )

   # mount /proc

   # mount /sys

   # mount -t devpts none /dev/pts

   The above commands mount the respective directories inside chroot.

   # apt-get update

   Install/remove necessary packages using apt.

   Cleanup the unwanted files.

   # apt-get clean
   # rm -rf /tmp/* /etc/resolv.conf
   # umount -l -f /proc
   # umount -l -f /sys
   #umount /dev/pts

   Exit chroot
   #exit

   Now replace the sources.list with the original sources.list

   # cp jaunty/remaster/etc/apt/soures.list.backup jaunty/remaster/etc/apt/soures.list

   Repack squashfs

   # cd jaunty
   # mksquashfs remaster image/casper/filesystem.squashfs

   Recreate filesystem.manifest& filesystem.manifest.desktop:
   Run the following commands.

   # dpkg-query -W -f=’${Package} ${Version}\n’ | tee image/casper/filesystem.manifest

   # cp -v image/casper/filesystem.manifest{,-desktop}

   # REMOVE=’ubiquity casper live-initramfs user-setup discover xresprobe os-prober libdebian-installer4′

   # for i in $REMOVE
   do
   sed -i “/${i}/d” image/casper/filesystem.manifest-desktop
   done

   Recreate md5sum

   #cd image && find . -type f -print0 | xargs -0 md5sum > md5sum.txt

   Recreate the iso image.

   # mkisofs -r -V “Jaunty_remi” -cache-inodes -J -l -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -o ../ubuntu-jaunty-remix.iso .

   # cd ..

   You can test the new image with virtual box.

6. When i got to the chroot prt, it didn’t work. Said it was impossible to chroot to the directory. By the way, those mount commands require root privilege.

7. I compiled the iso image, but i don get these things specified working when i boot up my customized Live cd.
   1. no volume control gstreamer plugins and/or devices found
   2. No network support, i cant connect to the internet
   3. Is there any tutorial to change the usplash theme of Ubuntu Live CD???

8. When running the ‘cp -r jaunty/root jaunty/remaster’ file permissions are not kept. So things like sudo are nolonger suid. That’s why the network didn’t start etc. Or the install.
   cp -r -p (p to preserve perms) would work better …
   Maybe should do a rsync -p -o jaunty/root jaunty/remaster

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