while attempting an upgrade, it failed to do it

[Aexis Tenax]

I followed the https://linuxconfig.org/ubuntu-upgrade-to-24-04-noble-numbat-a-step-by-step-howto-guide
and I got an error message claiming the upgrade had "abort"(ed) due to try to upgrade to a not released version, but it was the "noble numbat" one I tried to upgrade to. Ah, the update manager doesn't "see" noble numbat, so whenever I check the update manager it says all is ok with the latest updates, and the upgrade option is never shown (while my option in the update file is "lts"), so according to the update manager noble numbat was never released.
First time ever reporting a bug, so I hope I didn't screw up so badly ;-)

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: ubuntu-release-upgrader-core 1:22.04.19
ProcVersionSignature: Ubuntu 6.5.0-41.41.1~22.04.1-lowlatency 6.5.13
Uname: Linux 6.5.0-41-lowlatency x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Sat Jun 15 20:46:09 2024
InstallationDate: Installed on 2023-09-28 (261 days ago)
InstallationMedia: Ubuntu-Studio 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230807)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to jammy on 2024-06-15 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2024-06-10T20:00:38.713995