Ubuntu upgrade failed halfway: how to recover
Your 24.04 to 26.04 upgrade stopped: reattach the screen session, repair dpkg, fix half-flipped sources, and know when to restore the snapshot instead.
#do-release-upgrade
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do-release-upgrade: no new release found
Your Ubuntu server reports no new release found. Work through the Prompt setting, the LTS point release gate, third party repos and held packages.