Onmogelijk om te updaten na installatie ultramarine (Impossible to update ultramarine after installation)

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1

Downloaden van metadata (metalink: “https://tetsudou.fyralabs.com/metalink?repo=um44&arch=x86_64”) voor repository “ultramarine”: repomd.xml GPG signature verification error: Signing key not found mislukt

2

I edited your title to include the english translation.

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The update issue was resolved using `sudo dnf upgrade --nogpgcheck --no-best`. This resulted in the update of 856 packages, comprising 1,682 files.
The update succeeded.
Downloading metadata (metalink: “https://tetsudou.fyralabs.com/metalink?repo=um44&arch=x86_64”) for repository “ultramarine” failed: repomd.xml GPG signature verification error (signing key not found).
It is also possible to install apps using `--nogpgcheck`.
A very cumbersome way to get Ultramarine working, at least to some extent.
4

You should probably give this feedback to Ultramarine, which is a third-party product that Fedora has no control over.