A few weeks ago I installed a pre-release (daily), pre beta version of Kubuntu Lunar Lobster (23.04) in the belief I would be able to update it to the full release when it was released. Everything runs well, but I note that there are very few updates, and those mainly to themes and apps, not to the underlying O.S. How do I upgrade to the full release version? - I have noted and tried "sudo do-release-upgrade -d and sudo do-release-upgrade" and similar suggested on this website - however I get "no new release found" and nothing happens. Must I do a whole new install from a fresh download of the iso, or is there some command-line fu that will do the trick? (I'm trying to avoid the full re-install as my machine is a dual boot set-up and the safest way to avoid messing the boot partition is to remove the drive the other O.S. is on - its a NVme drive buried under heat sinks on the motherboard, a major hassle. If anyone can shed some light on this I would really appreciate it!
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