First, you will need to install snapd. Snapd is pre-installed on many Ubuntu distributions, but if yours is not one of them or you have a different flavor, the instructions for installation can be found at https://docs.snapcraft.io/installing-snapd/6735
Then, search in the snap store for Wickr and choose Wickr Pro, Wickr Enterprise, and/or Wickr Me (they all work simultaneously on one device) and use the appropriate instructions to install:
NOTE: If you have issues with Wickr after installation, please check that you have enabled permissions in the Snap Store:
On some distros, you may need to install the Snap Store using the command:
sudo snap install snap-store
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