for Ubuntu / Mint open terminal

use this command line to install rdesktop

sudo apt-get install rdesktop

hit enter

then type your password in hidden field

type y and hit enter

after installing rdesktop you have to type this command in terminal window

rdesktop 192.168.1.51

in this case my server ip is 192.168.1.51

a windows login window will pop up

use your login account and password to login

enjoy