I am on ubuntu 18.04 LTS. Right after I turn on Ubuntu, a red warning like icon appears in the gnome indicator which tells

The update information is outdated. This may be caused by network problems or by a repository that is no longer available. Please update manually by selecting 'Show updates' from the indicator menu, and watching for any failing repositories.

I clicked on Show updates. It just tells me Everything is up to date. Nothing is happening.


Try updating from the command line:

$ sudo apt update && sudo apt install --fix-missing && sudo apt upgrade

This should resolve your problems.

You can also try to get rid of old packages you don't need:

$ sudo apt autoremove && sudo apt autoclean

Finally, check out your apt sources and see if you maybe need to re-add any old PPAs from your last installation.

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