Screentoss apt repository (GPG-signed) — also hosts Filetoss
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# Screentoss
curl -fsSL https://screentoss.humanitics.eu/apt/install.sh | sudo bash

# Filetoss (same repo / same GPG key)
curl -fsSL https://screentoss.humanitics.eu/apt/install-filetoss.sh | sudo bash

# Both
curl -fsSL https://screentoss.humanitics.eu/apt/install-both.sh | sudo bash

# or manually:
sudo curl -fsSL -o /usr/share/keyrings/screentoss-archive-keyring.gpg \
  https://screentoss.humanitics.eu/apt/screentoss-archive-keyring.gpg
sudo curl -fsSL -o /etc/apt/sources.list.d/screentoss.list \
  https://screentoss.humanitics.eu/apt/screentoss.list
sudo apt update
sudo apt install screentoss    # remote screen
sudo apt install filetoss      # file transfer tray

Packages: screentoss, filetoss
(compat: old screentoss-agent / filetoss-agent names still Provide/Replace)
Key fingerprint: 5A7BC78DCCF88CC44274EB0227220E2D650BFE52
Armored pubkey: https://screentoss.humanitics.eu/apt/screentoss-archive-keyring.asc