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I agree, all the Linux ISO remastering apps seem to have been abandoned. Do you really need an ISO? An image file will do almost everything an ISO will do.and is much simpler. set up a Ubuntu disk as you want it and create an image with Disks. You can then use Rufus, Etcher, mkusb, etc to flash the installed system to another drive. An example of using such an image is here: askubuntu.com/questions/1217832/…
OK yeah this shows I don't know what I'm doing in terms of imaging, but I'm still going to keep an eye on this question to see if anyone has further insight on this topic.
Just use gnome-disks. Click on the drive, click on the gears icon, create a partition image, and you're done. You have a .img file that can be burned/written just like an .iso file. If you want, you can even convert the .img to .iso, but there's probably no need to do so.
@KGIII Making an image of a partition will not copy the bootloader, for that you need to make an image of the whole disk, that requires the icon with three lines on the upper right of Disks.
@KGIII I have just had some success creating a partition image as you suggest and then flashing it to a partition on a different drive and booting it. First I created a bios_grub partition then a boot,esp partition, (askubuntu.com/questions/1217832/…). After flashing the image file to the new drive I reinstalled GRUB and it booted. I guess there is no need to overwrite the whole drive.
bios_grub
partition then aboot,esp
partition, (askubuntu.com/questions/1217832/…). After flashing the image file to the new drive I reinstalled GRUB and it booted. I guess there is no need to overwrite the whole drive.