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Software Updater fail, and "apt-get update" throws "Invalid operation update" - what next?

rated 0 times [ 4] [ 0] / answers: 1 / hits: 34477 / 3 Years ago, sun, october 31, 2021, 2:17:32

I'm running a fairly vanilla 14.04 Ubuntu on a newish HP desktop. Just yesterday I got the dreaded "Failed to download repository information":

screenshot

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?!

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ellter

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2 Years ago

answered 3 Years ago tubequ · Accepted Answer

Usually this error happens when you mis-type the apt command, which doesn't seem to be case here (if I believe you).

Can you please login as su and then do the apt-get update?

I know using the system as Super User is not a good thing to do but at lease for one time, you can give it a try.

P.S. Is there a proxy on your network?