On Windows, you can create a bootable USB with Rufus. You'll find your my.iso and its md5sum in ~/tmp/remaster-new-files/ if you used a relative path. Sudo uck-remaster- pack-iso my.iso -h -g -d "My Live Ubuntu" If your filesystem was about 4 GB in size then the compressed image could be about 1 GB.Īfter that, you can create an ISO image.
This will take a few minutes and it will be faster if you have more cores available, so if you're doing this in a virtual machine, you should add more CPUs to it. When that's done, we need to pack it all up.įirst of all, pack the filesystem into one compressed SquashFS file. Now you can install packages with apt-get and perform all kinds of customizations. It will also mount /tmp and /var/apt/cache to ~/tmp so that you don't have to worry about cleaning up. You can do this with the following command. To install packages, restart services and test if your applications are working properly, you can change the root to the image filesystem. You can add, move and delete files from that directory.
The size of the ~/tmp directory together with the unpacked ISO file will be 4.1 GB. When that's done, the root filesystem will be located in ~/tmp/remaster-root and take up 3.1 GB of disk space. By default, it's ~/tmp.Īll UCK tools require root privileges for mounting and unmounting. That is because all the files and directories are compressed into one large file rootfs.squashfs that we also need to unpack. What you'll find is a bunch of files for init and booting, but not the actual filesystem. UCK has a very simple GUI wizard but it is very awkward to use, so we are going to use the command line tools to customize the image.Īn ISO image is like a tar archive so we need to extract it first. You can of course also use Kubuntu.įirst, let's install the required tools: sudo apt- get -y install uck syslinux If you later discover that you need to make additional customizations, you can also use your own ISO image that you customized previously. Its size is about 1 GB but you can reduce it by removing LibreOffice, Firefox and other applications. You can download it from the official Ubuntu website. We're going to use the official Ubuntu 14.04.3 LTS (Trusty Tahr) desktop installation ISO image ubuntu-14.04.3-desktop-amd64.iso.
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