How to upgrade from Ubuntu 22.04 to 23.04 using an iso file only?

Question

I want to upgrade my Ubuntu 22.04 LTS to Ubuntu 23.04 using an iso file only. I don't want to redownload any thing because my ISP gives me very limited amount of data and it's expensive. I would have no problem to reinstall the system from the iso file if I can somehow save my files and apps.

Answer 1

Upgrade from Ubuntu 22.04 to 23.04 using an ISO file.

• Create a Live install of 23.04 on your hard drive similar to: https://askubuntu.com/a/1251782/43926

• The GRUB menuentry is a little different for 23.4 than for 22.04, Use:

    menuentry "Try or Install ubuntu-23.04-desktop-amd64" {
  loopback loop /ubuntu-23.04-desktop-amd64.iso
    linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=/ubuntu-23.04-desktop-amd64.iso quiet splash locale=en_US bootkbd=us console-setup/layoutcode=us noeject --
    initrd (loop)/casper/initrd
    }
  

Boot the new ISO toram, Install Ubuntu 23.04 in free space.