Re: Muon Update Manager cannot find packages
It would be good to know which indexes have failed to download. That would be just above this error message.
E: Some index files failed to download. They have been ignored, or old ones used instead.
To get new packages especially kernels, often it is necesary to run:
Pay attention to the results of the command if it says things are going to be removed, "Just say NO". Then investigate what and why this is happening.
sudo apt-get dist-upgrade
First it would be good to know why you are getting index errors.
Something funky in your sources.list?
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