Syncthing

sudo apt-get install apt-transport-https
sudo apt-get install ca-certificates

# Add the release PGP keys:
sudo mkdir -p /etc/apt/keyrings
sudo curl -L -o /etc/apt/keyrings/syncthing-archive-keyring.gpg https://syncthing.net/release-key.gpg

# The stable-v2 channel is updated with stable release builds, usually every first Tuesday of the month.
# Add the "stable-v2" channel to the APT sources.
echo "deb [signed-by=/etc/apt/keyrings/syncthing-archive-keyring.gpg] https://apt.syncthing.net/ syncthing stable-v2" |
  sudo tee --append /etc/apt/sources.list.d/syncthing.list

# The candidate channel is updated with release candidate builds, usually every second Tuesday of the month.
# These predate the corresponding stable builds by about three weeks.
# Add the "candidate" channel to the APT sources, but leave it commented out.
echo "#deb [signed-by=/etc/apt/keyrings/syncthing-archive-keyring.gpg] https://apt.syncthing.net/ syncthing candidate" |
  sudo tee --append /etc/apt/sources.list.d/syncthing.list

sudo apt-get update
sudo apt-get install syncthing

which syncthing                 # /usr/bin/syncthing
syncthing --version             # syncthing v2.0.15 "Hafnium Hornet" (go1.26.0 linux-amd64) debian@github.syncthing.net 2026-02-11 10:41:38 UTC [noupgrade]
dpkg -L syncthing

file="/etc/ssh/sshd_config"
# Back up original file if backup file is missing.
if [ -f "${file}" ] && [ ! -f "${file}.org" ]; then sudo cp -a "${file}" "${file}.org"; fi
sudo sed -i "s/#AllowTcpForwarding yes/AllowTcpForwarding yes/" "${file}"
diff "${file}.org" "${file}"
sudo systemctl restart ssh