The following signatures were invalid: EXPKEYSIG 18DF3741CDFFDE29

[robert rottermann]

Hi folks

I get:
W: GPG error: http://deb.anydesk.com all InRelease: The following signatures 
were invalid: EXPKEYSIG 18DF3741CDFFDE29 philandro Software GmbH 
<info at philandro.com>
E: The repository 'http://deb.anydesk.com all InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore 
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

when I execute apt update.

Googling for a solution made me execute the following steps:


apt update
apt-get clean
mv /var/lib/apt/lists tmp
apt-get clean
apt-get update


I still have the same issue.

How can I fix it?

thanks for your info

rober