Am besten über die Software-Boutique unter System > Systemverwaltung

In case you don’t prefer Ubuntu software center or Snap package, use official PPA for install or upgrade. Run the below command into the Terminal:

sudo add-apt-repository ppa:remmina-ppa-team/remmina-next
sudo apt-get update
sudo apt-get install remmina remmina-plugin-* libfreerdp-plugins-standard

How to downgrade Remmina if Installed via PPA

If you are not satisfied with the new version, there is always a way to downgrade the software. Run the below command:

sudo apt-get install ppa-purge
sudo ppa-purge ppa:remmina-ppa-team/remmina-next

ODER

Otherwise, you can use the below Snap command to install:

snap install remmina

Moreover, don’t forget to run the following command one by one for some advanced features.

sudo snap connect remmina:avahi-observe :avahi-observe
sudo snap connect remmina:cups-control :cups-control
sudo snap connect remmina:mount-observe :mount-observe
sudo snap connect remmina:password-manager-service :password-manager-service