Encryption on Ubuntu: Just the commands
For set-up, see https://help.ubuntu.com/community/FolderEncryption
encfs ~/.ncryptd ~/ncryptd
where ncryptd is the name of your directory. Note the dot (.) in front of ncryptd in the first parameter of the encfs command; the encrypted version is an entirely different directory and could have a completely fidderent name from the directory you decrypt it into.
Type your password. Then you can go into the now-populated, writable directory with
fusermount -u ~/ncryptd
Note: The close command does not autocomplete on directory names. You have to type it all out, correctly.