cd /usr/local/bin
sudo update-alternatives --install /usr/bin/x-terminal-emulator x-terminal-emulator /usr/bin/alacritty 50
- If that didn't work
sudo update-alternatives --install /usr/bin/x-terminal-emulator x-terminal-emulator /usr/local/bin/alacritty 50
sudo update-alternatives --config x-terminal-emulator