Regarding the first error that you mention:
Err:17 http://ppa.launchpad.net/webupd8team/indicator-kdeconnect/ubuntu cosmic
Release
404 Not Found [IP: 91.189.95.83 80]
That is because that particular PPA (personal package archive) is not
available for Ubuntu 18.10. The webupd8 team only releases it for some
older Ubuntu versions. So please disable that software source.
The second message that you commented on is apparently due to Google
Earth repository, and you can report it to Google. That looks safe to
ignore anyway.
Let's see if that "check connection" message goes away when you disable
the webupd8team indicator-kdeconnect PPA.
** Changed in: linux (Ubuntu)
Status: Confirmed => New
** Package changed: linux (Ubuntu) => ubuntu
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https://bugs.launchpad.net/bugs/1806479
Title:
Multiple failures in distrobution 18.10
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