E: The repository 'https://ppa.launchpadcontent.net/flatpak/stable/ubuntu kinetic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
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user.dz
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You don't need a PPA to install Flatpak in Ubuntu 22.10, because it is already there in the default repositories. You got this error message because the PPA does not have a package for your version of Ubuntu.
First, remove the PPA.
sudo add-apt-repository --remove ppa:flatpak/stable
Then, update the APT index.
sudo apt update
Finally, install flatpak with
sudo apt install flatpak
Archisman Panigrahi
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