ketika mau menambahkan flathub dengan perintah

flatpak remote-add –if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

terjadi

error: Flatpak system operation ConfigureRemote not allowed for user

solusinya tambahkan perintah sudo

sudo flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo