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Re: Error Message

On Thu, Apr 11, 2019 at 07:03:08PM +0200, Michael Lee wrote:
> Hello, I would like to know what I am supposed to do about this error
> message. Would appreciate guidance.
> M Lee

> Nicht alle Paketquellenindizes konnten heruntergeladen werden
> Die Software-Paketquelle steht möglicherweise nicht mehr zur Verfügung oder ist aufgrund von Netzwerkproblemen nicht erreichbar. Sofern für diese Software-Paketquelle noch eine ältere Paketliste verfügbar ist, wird diese verwendet. Anderenfalls wird diese Software-Paketquelle gänzlich ignoriert. Bitte prüfen Sie Ihre Netzwerkverbindung und vergewissern Sie sich ebenfalls, dass die Adresse der Software-Paketquelle korrekt in den Einstellungen eingetragen ist.
> The repository 'http://ftp.de.debian.org/debian stretch/updates Release' does not have a Release file.Updating from such a repository can't be done securely, and is therefore disabled by default.See apt-secure(8) manpage for repository creation and user configuration details.http://ftp.de.debian.org/debian/dists/stretch-updates/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.http://ftp.de.debian.org/debian/dists/stretch/Release.gpg: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.

Looking at the error message (the English part, I can't read the German) 
I suspect the issue is the second part of the message, and the first 
part complaining that ftp.de.debian.org doesn't have a Release file is 
a red herring. It looks like ownership or permissions on your 
/etc/apt/trusted.gpg file are dodgy. Have a look at ownership and 
permissions on that file and, if it's not obvious to you what's wrong, 
post here the output of ls -l /etc/apt/trusted.gpg and hopefully it will 
be obvious to someone on here.

Have you been making changes to your apt configuration recently? If you 
have done anything in that area recently, describe that too as that may 
have a bearing on the problem.