A year ago, I customized an Ubuntu 7.10 iso following this guide: http://www.linuxjournal.com/article/10038
However, I want to update the base system of my customized iso to at least Ubuntu 8.04. How do I do that?
One idea I think may work is:
sudo chroot ./isonew/custom
mount -t proc none /proc/
mount -t sysfs none /sys/
rm -rf /tmp/*
But, I am not sure if it works...could anyone verify this for me (I tested it once, but then the power went off when I was 80% done with the download which took 2 hours on my slow connection. So, I don't want to waste 2.5 hours to see that it failed)?