I am reaching out to you for help with installing Flatpak applications on an external drive. I have already completed all the steps for a custom installation according to this guide, but when I try to install applications from the Flathub repository, I receive a series of errors that I do not know how to resolve. I believe these errors are related to the public key and file write permissions. I am attaching the errors below and I hope for any suggestions on what to do next.
$ flatpak --installation=extra install flathub org.cataclysmdda.CataclysmDDA
Ostrzeżenie: Failed to get revokefs-fuse socket from system-helper: Failed to chown /run/media/cheslavic/001A-28CD/flatpak/repo/tmp/flatpak-cache-4J9UW2 to user flatpak: Operation not permitted
Ostrzeżenie: Podczas pobierania runtime/org.cataclysmdda.CataclysmDDA.Locale/x86_64/stable z repozytorium flathub: Commit 724d46e5b7c4db232665aa42b7b9cbab2a1a18583bd856a6a4ed9e23ad1c5759: Signature made nie, 11 sie 2024, 01:39:03 using RSA key ID 562702E9E3ED7EE8
Can't check signature: public key not found
Ostrzeżenie: Failed to get revokefs-fuse socket from system-helper: Failed to chown /run/media/cheslavic/001A-28CD/flatpak/repo/tmp/flatpak-cache-BJ2GW2 to user flatpak: Operation not permitted
Ostrzeżenie: Podczas pobierania runtime/org.freedesktop.Platform.GL.default/x86_64/23.08 z repozytorium flathub: Commit 0417ef24351ecbb9208216510d7190ce94aa483f812b713b9b00e4ff5987b968: Signature made wto, 29 paź 2024, 06:10:15 using RSA key ID 562702E9E3ED7EE8
Can't check signature: public key not found
Ostrzeżenie: Failed to get revokefs-fuse socket from system-helper: Failed to chown /run/media/cheslavic/001A-28CD/flatpak/repo/tmp/flatpak-cache-HHDNW2 to user flatpak: Operation not permitted
Ostrzeżenie: Podczas pobierania runtime/org.freedesktop.Platform.GL.default/x86_64/23.08-extra z repozytorium flathub: Commit d64b09e6ab6999efdda4a655853cfca8432335ff680d0072793433d957ee3921: Signature made wto, 29 paź 2024, 06:12:38 using RSA key ID 562702E9E3ED7EE8
Can't check signature: public key not found
Ostrzeżenie: Failed to get revokefs-fuse socket from system-helper: Failed to chown /run/media/cheslavic/001A-28CD/flatpak/repo/tmp/flatpak-cache-9EDHW2 to user flatpak: Operation not permitted
Ostrzeżenie: Podczas pobierania runtime/org.freedesktop.Platform.Locale/x86_64/23.08 z repozytorium flathub: Commit b19a201528f57ca521eef2a5b7e4a2f81c1922b8580a776a431844249a901f26: Signature made wto, 29 paź 2024, 06:12:14 using RSA key ID 562702E9E3ED7EE8
Can't check signature: public key not found
Ostrzeżenie: Failed to get revokefs-fuse socket from system-helper: Failed to chown /run/media/cheslavic/001A-28CD/flatpak/repo/tmp/flatpak-cache-KP9LW2 to user flatpak: Operation not permitted
Ostrzeżenie: Podczas pobierania runtime/org.freedesktop.Platform.VAAPI.Intel/x86_64/23.08 z repozytorium flathub: Commit 9949efc4b291bdc5c06b22e0170e0cd6a494a0da83e31db3792200aa8c7992c0: Signature made wto, 29 paź 2024, 06:14:10 using RSA key ID 562702E9E3ED7EE8
Can't check signature: public key not found
Ostrzeżenie: Failed to get revokefs-fuse socket from system-helper: Failed to chown /run/media/cheslavic/001A-28CD/flatpak/repo/tmp/flatpak-cache-IZYFW2 to user flatpak: Operation not permitted
Ostrzeżenie: Podczas pobierania runtime/org.freedesktop.Platform.openh264/x86_64/2.2.0 z repozytorium flathub: Commit bf24f23f3ba385f6e8c9215ed94d979db99814b0b614504a23a6d0751dc5f063: Signature made sob, 11 mar 2023, 21:16:31 using RSA key ID 562702E9E3ED7EE8
Can't check signature: public key not found
Ostrzeżenie: Failed to get revokefs-fuse socket from system-helper: Failed to chown /run/media/cheslavic/001A-28CD/flatpak/repo/tmp/flatpak-cache-B1SZW2 to user flatpak: Operation not permitted
Błąd: Podczas pobierania runtime/org.freedesktop.Platform/x86_64/23.08 z repozytorium flathub: Commit 0a3508e2e09c748e207965e0c0e25a52e6ae77716230be986cbbfb4b29295eb5: Signature made wto, 29 paź 2024, 06:12:11 using RSA key ID 562702E9E3ED7EE8
Can't check signature: public key not found
błąd: Zainstalowanie org.freedesktop.Platform się nie powiodło: Podczas pobierania runtime/org.freedesktop.Platform/x86_64/23.08 z repozytorium flathub: Commit 0a3508e2e09c748e207965e0c0e25a52e6ae77716230be986cbbfb4b29295eb5: Signature made wto, 29 paź 2024, 06:12:11 using RSA key ID 562702E9E3ED7EE8
Can't check signature: public key not found