Err, that's... simply not right. The difference isn't that dramatic. $ docker run -it ubuntu:16.04 sh -c 'apt-get update && apt-get install phantomjs' 13

Err, that's... simply not right. The difference isn't that dramatic. $ docker run -it ubuntu:16.04 sh -c 'apt-get update && apt-get install phantomjs' 134 newly installed. After this operation, 339 MB of additional disk space will be used. $ docker run -it ubuntu:16.04 sh -c 'apt-get update && apt-get install chromium-browser' 202 newly installed. After this operation, 615 MB of additional disk space will be used.