@mcappell firstly, please check if you have .htaccess file under the root folder, /pub and /pub/static/ folders. If not, then just download .htaccess file from the magento version you use and insert into the proper place.
If it's not a problem, then please check the rights on the folders with the command "ll" in the temrinal. If you don't have write access to /pub/static/ folder, than run next command in the teminal from the magento root:
sudo chmod -Rf 777 pub/
If it doesn't help, try the last one step. Remove next folders:
pub/static/_requirejs
pub/static/adminhtml
pub/static/frontend
and file:
pub/static/deployed_version.txt
and run next commands in the terminal under the magento root directory:
sudo php bin/magento setup:static-content:deploy
sudo chmod -Rf 777 pub/
