Creating a bootable iso image from my current installation

We have an old physical machine with *Ubuntu distro 20.04* and that physical machine has a total of

/root partition

and

as swap memory

. We have currently utilized up to 45GB. We want to create a bootable ISO image from that current installation. Also, we tried to create an image using the below packages. While running these packages, we are facing an error -- “filesystem.squashfs size exceeds more than 4GB”. Then we verified that the filesystem file consumes more than 8GB. So that, we cannot able to create an image file. Is there any other package/tool to create an image from the current installation? Thanks! 1.remastersys – respin - https://itectec.com/ubuntu/ubuntu-build-the-own-ubuntu-iso/ 2.distroshare image builder - https://github.com/Distroshare/distroshare-ubuntu-imager