What a coincidence! A friend who is running Ubuntu 18.04 in his laptop also had the same problem. The update manager said that there is no Internet when there was a working Internet connection.

So, I just opened the terminal for him, and typed

 sudo apt update && sudo apt dist-upgrade

and run the update through the Terminal, and it worked.

I am not running Ubuntu 18.04, but I suspect there was some kind of regression or new bug introduced in last update. This is just a guess based on my friend's and your experience.

On 4/24/20 9:57 PM, Dick Steffens wrote:
When I run Software Updater on one of my Ubuntu 18.04 machines (ENU-1). In April, 2018, I installed Ubuntu MATE 18.04. At some point, alas not documented, I switched to XFCE. In May, 2019, I installed Xubuntu 18.04 on my other desktop machine (ENU-2), and migrated to it for daily use. ENU-1 just sits over on the other desk and quietly runs. I never got around to moving my in-house web setup to ENU-2, so ENU-1 is doing something. But usually I just forget that it's there.

Today I wanted to change something on an in-house web page and looked at its monitor. There was a notice of software upgrades being available. I did the change I needed to do, and then tried to run Software Updater. I get an error message:

Failed to download repository information
Check your Internet connection.

The Internet connection is fine.

The error dialog box has a button for Settings. After stepping through all the tabs, but not seeing anything useful, I closed the Settings box, and the main Software Updater box filled up with all the stuff that needs updating. I click on Install Now, the box briefly changes to the one that shows progress of the install, but then disappears. No further error message.

Where do I start to troubleshoot this?

Thanks.

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