If you are new to Linux and want to connect Remote Desktop then application "Remmina " is your best candidate. It lets you to connect remote machine through SSH, RDP and Bastion
When you connect first time, you might get the error "You requested an H264 GX mode for server [snip], but your libfreerdp does not support H264. Please check Color Depth settings."
This means , the dafault Remmina client built-in on your machine needed to be updated.
Follow this commands,
- sudo apt-add-repository ppa:remmina-ppa-team/remmina-next
- sudo apt update
- sudo apt install remmina remmina-plugin-rdp remmina-plugin-secret
- sudo killall remmina
Now you will get the latest "Remmina client" installed on your machine which will accept the H264 color depth.