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Q. Does sudo apt upgrade now also fail with The following packages have unmet dependencies: libignition-plugin-dev : Depends: libignition-plugin (= 1.2.1+osrf-1~jammy) but 1.2.1-1~focal is installed E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

Q. Does sudo apt upgrade now also fail with The following packages have unmet dependencies: libignition-plugin-dev : Depends: libignition-plugin (= 1.2.1+osrf-1~jammy) but 1.2.1-1~focal is installed E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

Added 06/24/2022: In my case. I had a working Ubuntu 20.04 image with a working ROS2 Foxy and Galatic. The Humble binary install required Ubuntu 22.04, so I ran Ubuntu 20.04 to 22.04 upgrade. Did apt update and apt upgrade and then sudo apt install ros-humble-desktop which failed.