Note: There is a problem with the current Snap package. Please make sure that scdaemon is installed by typing
apt-get update && apt-get install scdaemon in a terminal and follow the instruction below.
Snapd is already installed on Ubuntu, for distros like Arch, Debian, Fedora, or Gentoo you need to install snapd first. As soon as you have Snap installed you can open a terminal and type
sudo snap install nitrokey-app --devmode
In case you get the error "failed to create user data directory. errmsg: Permission denied" during starting the Nitrokey App, it may is because your home directory is encrypted. In this case, apply one of these fixes  .