Ask Ubuntu Asked by user1079583 on December 4, 2020
I just installed Flatpak recently but after installing it, I can’t find the apps in Ubuntu Software Center. I installed the Flatpak plugin for Ubuntu Software Center and I can’t find any apps.
Actually, I found the flatpak sourced apps but it signed me out of UbuntuOne, so I signed back in then… gone I can’t find the flatpak sourced apps!
You can install flatpak using command line and install an available application from its public repository called flathub.
sudo apt install flatpak
Add flathub as source repository.
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
You can search and install any flatpak software. (For example firefox).
flatpak search firefox
flatpak install flathub org.mozilla.firefox
Here org.mozilla.firefox is Application ID of firefox in flathub.
You can also install the application by downloading .flatpakref files.
On flathub, by clicking on Install button will download .flatpakref file for application or you can also install application it by copying its URL. For example firefox.
flatpak install <Path of .flatpakref file you downloaded from flathub>
flatpak install https://flathub.org/repo/appstream/org.mozilla.firefox.flatpakref
Correct answer by KK Patel on December 4, 2020
The pre-installed software store application in Ubuntu 20.04 is a snap application (Snap Store) (source: OMG! Ubuntu article). It doesn't seem to support the flatpak plugin.
As a workaround you can install the traditional (GNOME) Software application by running the following command in Terminal
sudo apt install gnome-software
You also need to install the gnome-software-plugin-flatpak (which you have already installed apparently).
sudo apt install gnome-software-plugin-flatpak
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
Additionally, you may remove the pre-installed Snap Store by
snap remove snap-store
Answered by pomsky on December 4, 2020
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