If having a GUI package manager is not important to you, you could manage flatpaks (search, install, remove, repair, etc) from the command line.
See: man flatpak and/or flatpak --help
Example:
searching for an application for playing podcasts:
$ flatpak search podcast
Name Description Application ID Version Branch Remotes
Podcasts Listen to your favorite shows org.gnome.Podcasts 0.5.1 stable flathub
Kasts Podcast application org.kde.kasts 22.06 stable flathub
Leopod Organize and listen to your podcasts! com.github.leggettc18.leopod 1.1.1 stable appcenter
Rhythmbox Play and organize your music collection org.gnome.Rhythmbox3 3.4.6 stable flathub
Liferea RSS feed reader net.sourceforge.liferea 1.13.9 stable flathub
Tauon Music … Play your music with style com.github.taiko2k.tauonmb 7.4.2 stable flathub
Pocket Casts Online podcast player tech.feliciano.pocket-casts 0.5.0 stable flathub
gPodder Media aggregator and podcast client org.gpodder.gpodder 3.11.0 stable flathub
gPodder-adap… Media aggregator and podcast client for mobile and desk… org.gpodder.gpodder-adaptive 3.11.0+1 stable flathub
CPod A simple, beautiful podcast app com.github.z.Cumulonimbus 1.28.0 stable flathub
Vocal A Great Podcast Client for the Modern Free Desktop …github.needleandthread.vocal 2.4.2 stable flathub
Kodi The ultimate entertainment center tv.kodi.Kodi 19.4-Matrix stable flathub
Installing vocal:
$ flatpak install com.github.needleandthread.vocal
Looking for matches…
Info: applications using this runtime:
com.github.needleandthread.vocal
com.github.needleandthread.vocal permissions:
ipc network fallback-x11 pulseaudio wayland x11 dri file access [1] dbus access [2]
[1] xdg-data/vocal:create, xdg-run/gvfsd
[2] org.freedesktop.Notifications, org.freedesktop.secrets, org.gnome.SessionManager, org.gnome.SettingsDaemon.MediaKeys, org.gtk.vfs.*, org.mate.SettingsDaemon, org.xfce.SessionManager
ID Branch Op Remote Download
1. com.github.needleandthread.vocal.Locale stable i flathub < 282.9 kB (partial)
2. com.github.needleandthread.vocal stable i flathub < 20.5 MB
Proceed with these changes to the system installation? [Y/n]: