sudo port install jpeg doesn't work

[rap_bellarmine@…]

port search jpeg works port list works

but when i install them, this is the only thing that happens

ralph-macbook:~ ralph$ sudo port install jpeg

WARNING: Improper use of the sudo command could lead to data loss or the deletion of important system files. Please double-check your typing when using sudo. Type "man sudo" for more information.

To proceed, enter your password, or type Ctrl-C to abort.

Password: ralph-macbook:~ ralph$

no actual installation actually happens. when i type port installed the terminal returns "no ports installed"

i also tried other portfiles to install, but still the same thing happens