Hello,

Here is what I have, trying to run Kdenlive on Ubuntu 18.04 :

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flatpak run org.kde.kdenlive

(process:3): Gtk-WARNING **: Locale not supported by C library.
   Using the fallback 'C' locale.
Gtk-Message: Failed to load module "canberra-gtk-module"
Gtk-Message: Failed to load module "canberra-gtk-module"
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
Could not initialize GLX

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flatpak list
Ref                                   Options       
com.xamarin.MonoDevelop/x86_64/stable user,current 
org.freedesktop.Sdk/x86_64/1.4        user,runtime 
org.kde.kdenlive/x86_64/stable        system,current
org.kde.Platform/x86_64/5.11          system,runtime

Thank you

Fixed !

I updated my Nvidia driver from 390 to 396 sooner today.

I "purged" flatpak itself"

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sudo apt purge -y flatpak && sudo apt auto-remove -y
sudo apt install -y flatpak gnome-software-plugin-flatpak && flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo && flatpak update


It downloaded drivers again and now everything is fine.
I hope this won't happen each time I update this sh-- erm.. Nvidia proprietary driver lol.