I am trying to install Firefox and geckodriver in an Ubuntu docker container:

docker run ubuntu -it sh

then

apt-get -y update
apt-get -y install snapd
apt-get install firefox

the command which firefox returns /usr/bin/firefox but firefox --version returns

Command '/usr/bin/firefox' requires the firefox snap to be installed.
Please install it with:

snap install firefox

then I run snap install firefox it returns:

error: cannot communicate with server: Post "http://localhost/v2/snaps/firefox": dial unix /run/snapd.socket: connect: no such file or directory

What does it mean and what should I do?

Also for the next step, I want to install geckodriver. How should I do that?

The ultimate goal is to be able to run

firefox --version
geckodriver --version