I tried several solutions, but I was not able to get any of them to work.
Here is my code:
jing-Inspiron-3670:~$ sudo docker build . -f ./dockerfile . -t mhcflurry:latest .
[sudo] password for jing:
"docker build" requires exactly 1 argument.
See 'docker build --help'.
Usage: docker build [OPTIONS] PATH | URL | -
Build an image from a Dockerfile