JACL desktop — Debian/Ubuntu (apt)

curl -fsSL https://dangarstu.github.io/JACL/jacl.gpg | sudo gpg --dearmor -o /usr/share/keyrings/jacl.gpg
echo "deb [signed-by=/usr/share/keyrings/jacl.gpg] https://dangarstu.github.io/JACL stable main" | sudo tee /etc/apt/sources.list.d/jacl.list
sudo apt update && sudo apt install jacl-desktop

Other Linux: the .AppImage on the Releases page runs anywhere, no install.