The latest releases of Swift 4 from the Swift-Arm Community are now available in a new apt-get repository.

To install the repository:-

curl -s https://packagecloud.io/install/repositories/swift-arm/release/script.deb.sh | sudo bash

The following packages are available:-

• Raspbian Stretch / armv7 / RPi2/RPi3/RPi3+ – sudo apt-get install swift4
• Raspbian Stretch / armv6 / RPI1/RPi0 – sudo apt-get install swift4rpi01
• Ubuntu Xenial 16.04 / armv7 / – sudo apt-get install swift4
• Ubuntu Xenial 16.04 / arm64 / – sudo apt-get install swift4
• Ubuntu Bionic 18.04 / arm64 / – sudo apt-get install swift4

NOTE: For armv6 Raspberry Pi’s use – sudo apt-get install swift4rpi01
NOTE: If you get this error – Unable to locate package swift4 it means there is no package available for your device/OS system.

See here for a list of available packages – https://packagecloud.io/swift-arm/release