i really searched hard on this before i posted this thread!
But it seems like this is a very specific topic.
I installed a free Microsoft Office alternative: FreeOffice
How to install and information about adding the repository for automatic updates
https://www.freeoffice.com/en/tips-and- ... ubuntumint
To get the updates i executed
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sudo /usr/share/freeoffice2018/add_apt_repo.sh
As many others (for different applications) have claimed, i now get the error-message when refreshing the available updates:
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GPG-Fehler: http://shop.softmaker.com/repo/apt wheezy InRelease: Die folgenden Signaturen konnten nicht überprüft werden, weil ihr öffentlicher Schlüssel nicht verfügbar ist: NO_PUBKEY 3413DA98AA3E7F5EDas Depot »http://shop.softmaker.com/repo/apt wheezy InRelease« ist nicht signiert.
(?? http://shop.softmaker.com/repo/apt wheezy ??)
I already tried:
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sudo apt-key adv --keyserver "http://shop.softmaker.com/repo/apt wheezy InRelease" --recv-keys 3413DA98AA3E7F5E
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sudo apt-key adv --keyserver http://shop.softmaker.com/repo/apt --recv-keys 3413DA98AA3E7F5E
If i try to import the .key-file via GUI nothing happens (Screenshot of import-dialog also attached)
The feedback of gpg --list-key is
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/home/XXXXXXX/.gnupg/pubring.kbx
----------------------------------
pub rsa2048 2018-01-04 [SC]
CC7D2EDF4808EFFA0E00FC723413DA98AA3E7F5E
uid [ unbekannt] SoftMaker repository (GPG key for signing files) <info@softmaker.com>
Maybe someone has experience at dealing with PUBKEYS
Thank you a lot