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Please don’t paste terminal output as image, paste it as text
sorry about that
you should be able to fix by downloading the key:
wget https://flathub.org/repo/flathub.gpg
flatpak remote-modify flathub --gpg-import=path to flathub.gpg
Some additional info:
for a system installation these files would be under /var/lib/flatpak/repo/
for a user installation these files would be under ~/.local/share/flatpak/repo/
the file name after import/post installation is: flathub.trustedkeys.gpg
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after a update that issue was fixed so this gpg import is not required
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