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.
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Fix broken packages in apt: unmet dependencies
Broken packages in apt can mean two faults. Learn to tell an unconfigured .deb from a resolver refusal, then find the real blocker before you blame a hold.