The Problem

After working reliably for months, Flatpak began throwing a GPG verification error whenever I tried to update or install applications:

# Attempt to update Flatpaks
flatpak update

# ERROR SHOWN
# error: Unable to load summary from remote flathub: GPG verification enabled, but no summary found (check that the configured URL in remote config is correct)

The Flathub remote configuration and URL looked correct:

flatpak remotes -d

# OUTPUT
# Name    Title    URL                                    Collection ID Subset Filter Priority Options
# flathub Flathub  https://dl.flathub.org/repo/           -             -      -      1        system

Standard troubleshooting steps didn’t resolve the issue:

  • Verified the GPG file was present in the system.
  • Cleared Flatpak cache.
  • Ran flatpak repair.

The Solution

Remove and reinstall the Flathub remote. Your installed applications won’t be affected (there is no need to uninstall any app).

Step 1: Remove the Remote Configuration

Edit /var/lib/flatpak/repo/config and delete the entire [remote "flathub"] section:

# Edit "/var/lib/flatpak/repo/config"
vim /var/lib/flatpak/repo/config

# Remove this whole [remote] section:
# [remote "flathub"]
# url=https://dl.flathub.org/repo/
# xa.title=Flathub
# gpg-verify=true
# gpg-verify-summary=true
# xa.comment=Central repository of Flatpak applications
# xa.description=Central repository of Flatpak applications
# xa.icon=https://dl.flathub.org/repo/logo.svg
# xa.homepage=https://flathub.org/

Step 2: Reinstall the Flathub Remote

Add the remote back using the official setup command for your distribution:

# Re-install Flathub in Fedora
flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo

Verify the Fix

  • Test that everything works.
  • Updating Flatpaks should now go as expected. No more warnings or errors.
flatpak update