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I've fought with this a few times recently, too. I've done the following in no particular order on a few machines and distributions, for both electric & diamondback:

Completed forgotten half-finished distro upgrades
Reviewing what's in /etc/apt/sources.list.d/ros-latest.list
Using aptitude install instead of apt-get install (you'll need to install aptitude first)
Uninstalling and re-installing with apt-get
Remembering to run apt-get update first

On my end, these errors seem to be correlated with upgrading a distro, then upgrading ROS.

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