Bloquear sites no linux

 # vim /etc/hosts

 127.0.0.1 www.sitequedesejabloquear.com

instalar Debian - RetroArch - flatpak

 instale o flatpak

 # apt-get install flatpak

Instalar RetroArch

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

$ flatpak install --user flathub org.libretro.RetroArch

 

executar RetroArch

 $ flatpak run org.libretro.RetroArch

Atualizar RetroArch

 $ flatpak update --user org.libretro.RetroArch

 

OBS: caso de algum problema para rodar o flatpak ou a mensagem abaixo 

Note that '/opt/myapp/share' is not in the search pathset by the XDG_DATA_HOME and XDG_DATA_DIRSenvironment variables, so applications may notbe able to find it until you set them. Thedirectories currently searched are:

tente...

$ echo export 'XDG_DATA_DIRS="/opt/myapp/share:$XDG_DATA_DIRS"' >> ~/.xsessionrc

$ reboot