Hi Tanja, first my condolences as well.
quite hard to troubleshoot this from afar, I think the better way is contacting your local Linux User Group [1]. Most likely the the people there can also help you with potential problems further down the line (e.g. GPG). Would be a shame trying different things advised on the internet just to make matters worse :/ [1] https://lugfrankfurt.de/ good luck -- Georg
