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I wanted to install cachyos from medium cachyos-kde-linux-240609.iso and on multiple systems and everytime the installer failed with the following error:

cachyos error: archlinux-keyring signature from christian hesse is unknonw trust

How where I able to fix it?

I've opened the terminal and ran the following commands:

sudo pacman-key --refresh-keys sudo pacman-key --populate sudo pacman -S archlinux-keyring

After that, the installation runs through without any issues.