E: Invalid operation update

[Guest]

A screenshot of this window has been seen on AskUbuntu before. I have checked related threads here, and also looked at a helpful off-site article. The strange thing now is that when I run sudo apt-get update I get back E: Invalid operation update, so I can't even work out what the offending PPA is.
The Updater does find updates and apply them (you can see what I got today if you like), but that's little help in diagnosing the problem.

So my question: HOW DO I FIX THIS?! (pd: its not my post, but is the same ploblem)
http://askubuntu.com/questions/52185...eration-update

[Snowhog]

Post your sources.list (/etc/apt/sources.list) and any third-party lists that you might have in /etc/apt/sources.list.d/

[Guest]

Post your sources.list (/etc/apt/sources.list) and any third-party lists that you might have in /etc/apt/sources.list.d/

/etc/apt/sources.list




/etc/apt/sources.list.d

[Snowhog]

So, you are running Ubuntu, not Kubuntu, based on the images you posted. Just to confirm: Is that the case? You are running Ubuntu 16.04?

You have a lot of third-party repositories, and while identified as 'for Xenial', that's no guarantee that there won't be packaging conflicts at times. That said, and again from the posted images, you seem to be doing package maintenance from a graphical application. I'd suggest opening a console and doing it from the command line; it may yield more useful information, like which specific repository is being complained about.

In a console type:

sudo apt update && sudo apt full-upgrade

The first part ensures that the package information is up to date. The second part will perform an intelligent update to all existing installed packages. IF there are any issues that need attention, you will be so informed.