Cookiecutter-django: ./manage.py compilemessages doesn't work with docker

[lanterno]

Hi,
I've been working with django cookiecutter for sometime now. I'm working on a project where we provide the site in 3 languages. I use docker for deployment and I was just trying to run:
docker-compose run django python manage.py compilemessages

but I got this error
CommandError: Can't find msgfmt. Make sure you have GNU gettext tools 0.15 or newer installed.

I tried adding this line to the django dockerfile
RUN apt-get install gettext libgettextpo-dev
but I got another error
Package 'gettext' has no installation candidate
Unable to locate package libgettextpo-dev

I think this is because the Python image isn't built on ubuntu. I'm not sure what's the alternative.
I'm still looking but I thought about asking here in case someone else came across the same problem.

Thanks guys.

[lanterno]

So the problem was easier than I thought :)
I just had to apt-get update
so the command I added is
RUN apt-get update && apt-get install -y gettext libgettextpo-dev