first commit from PC

misc/ubuntu-gui/Dockerfile

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+FROM ubuntu:latest
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install -y flatpak && apt-get upgrade -y
+RUN flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+RUN flatpak install app/org.mozilla.firefox/x86_64/stable -y --noninteractive
+CMD ["/usr/bin/firefox"]