FreeRDP

FreeRDP is a free RDP client for Linux.  One issue with other options such as rdesktop is an error is returned if the remote Windows Server was configured to only accept connections with Network Level Authentication.  Clients such as rdesktop may return an error upon attempting to connect:

Failed to connect, CredSSP required by server

The FreeRDP client includes support for this configuration.  It can be installed via the command below:

sudo apt install freerdp2-x11

An example of a command to connect to a remote server would be:

xfreerdp /u:"username"  /dynamic-resolution /v:servername:3389

https://www.freerdp.com