Get Zync

 # 1. Prepare the APT keyring directory (missing on minimal installs)$sudo install -m 0755 -d /etc/apt/keyrings  # 2. Add the GPG key$curl -fsSL https://apt.zync.thesudoer.in/key.gpg | sudo gpg --dearmor -o /etc/apt/keyrings/zync.gpg$sudo chmod a+r /etc/apt/keyrings/zync.gpg  # 3. Add the repository$echo "deb [signed-by=/etc/apt/keyrings/zync.gpg] https://apt.zync.thesudoer.in stable main" | sudo tee /etc/apt/sources.list.d/zync.list  # 4. Update and install$sudo apt update && sudo apt install zync

 # 1. Import and locally sign the Zync packaging key (same key as APT)$curl -fsSL https://arch.zync.thesudoer.in/key.gpg -o /tmp/zync.gpg$sudo pacman-key --add /tmp/zync.gpg$FPR="$(gpg --show-keys --with-colons /tmp/zync.gpg 2>/dev/null | awk -F: '/^fpr:/ { print $10; exit }')"$sudo pacman-key --lsign-key "$FPR"  # 2. Add the Zync pacman repo drop-in$sudo tee /etc/pacman.d/zync.conf >/dev/null <<'EOF'$[zync]$SigLevel = Required TrustedOnly$Server = https://arch.zync.thesudoer.in/$arch$EOF  # 3. Include it from pacman.conf (once)$grep -q 'pacman.d/zync.conf' /etc/pacman.conf ||   echo 'Include = /etc/pacman.d/zync.conf' | sudo tee -a /etc/pacman.conf  # 4. Install$sudo pacman -Syu zync