I am using ubuntu 26.04 and installed flatpak:
sudo apt-get install flatpak
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak remotes
when I try ton install an app I get this
This the same for all apps. What can I do?
When installing an application over the command line you have to enter the app-id, not the name of the app.
Just search the application on flathub.org and click on the down-error on the Install button. You can then copy the installation command.
Just search the application on flathub.org and click on the down-error on the Install button. You can then copy the installation command.
That’s exactly what I have done but I always get this result:
F: An error was encountered searching remote ‘flathub’ for ‘flatseal’: Unable to load summary from
remote flathub: Signature made Do 06 Aug 2026 10:15:15 CEST using RSA key ID 562702E9E3ED7EES
Can’t check signature: public key not foundFohles) No remote refs found for ‘flatseal”
But it seems that there must be a problem with this ID key, but I don’t know how I can correct it.
How did you install flatpak? As far as I know Ubuntu doesn’t ship with flatpak, but snap.
Did you follow this guide https://flathub.org/de/setup/Ubuntu ?
Edit: Pls run the install command with --verbose at the end.
I purged flatpak completely and reinstalled it new and now it works perfectly. 
