Remmina

Great client application for connecting by RDP/VNC/etc. I installed it on Ubuntu 18.04 like this:

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sudo add-apt-repository ppa:remmina-ppa-team/remmina-next
sudo apt update
sudo apt install remmina \
  remmina-plugin-exec \
  remmina-plugin-kwallet \
  remmina-plugin-nx \
  remmina-plugin-rdp \
  remmina-plugin-secret \
  remmina-plugin-spice \
  remmina-plugin-vnc \
  remmina-plugin-www \
  remmina-plugin-xdmcp \
  libfreerdp-plugins-standard 
sudo ln -s /usr/lib/x86_64-linux-gnu/libssh.so.4 /usr/lib/x86_64-linux-gnu/libssh_threads.so.4

More information is available on their page.