How do you delete files in the location: /usr/local/src?

I tried to move a file into the rubbish bin (because I followed some instructions about installing sage and it involved moving a file to that directory) and it gave me errors saying that I didn't have permission. Even though I'm signed in as an administrator.

Open a terminal with Ctrl-Alt-T and Use sudo like this.

cd /usr/local/src
sudo rm ./file-name

If you want to delete the entire content of a folder, you should use -r switch. like this:

cd /usr/local/src
sudo rm -r ./folder-name

Please, make sure you aren't deleting any system files. Also double check the file and folder name before hitting Enter key.