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use xenial-220-beta example : RUN echo "debbigbluebutton-xenial main " | tee /etc/apt/sources.list.d/bigbluebut$ RUN wget-O- | apt-key add -

add-apt-repository ppa:bigbluebutton/support -y

Change method that you’re starting docker image. 1. sudo docker run -ti -d –privileged=true images_docker ”/sbin/init” 2. su...

cd /tmp/ && wget&& apt-key add /tmp/nginx_signing.key sudo sh -c "echo 'deb'$(lsb_release -cs)' nginx' > /etc/apt/sources.list.d/N...

czytaj więcej: Cathode-ray tube repair process

check this article:

1. curl -o /tmp/new_gitlab_gpg.key 2. apt-key add /tmp/new_gitlab_gpg.key 3. apt update