Diskussion:APT/Fehlerbehebung

Method 1: the sensible way

# apt-key list

Depending on your system you may see a couple of entries appear or a veritable avalanche. Scroll through the list carefully. Pay attention to how things are laid out. Find the section that mentions the package listed in the initial warning (if you see multiple warnings you will need to repeat these steps for each one in turn). In my case I’m looking for the key related to TeamViewer, and it looks like this:

pub rsa4096 2020-01-29 [SC]
8CAE 012E BFAC 38B1 7A93 7CD8 C5E2 2450 0C12 89C0
uid [ unknown] TeamViewer Germany GmbH (TeamViewer Linux 2020) <support@teamviewer.com>

Copy the last 8 characters from the second line — in the example above this is 0C12 89C0 — and convert it to a .gpg file using the command below. Remember to drop the space between the 8 characters and specify a gpg file name that is relevant to the package the key is for.

In my example I had to run:

sudo apt-key export 0C1289C0 | sudo gpg --dearmour -o /etc/apt/trusted.gpg.d/teamviewer.gpg

Once you’ve constructed your command hit enter …That’s all you need to do.

When you next run an apt update the deprecated key error will no longer appear for the repo you just applied (though if you have more than one repo affected, you’ll need to repeat the steps above for each one).