Ubuntu 22.04 stack (cflinuxfs4) buildpacks are here and Ubuntu 18.04 (cflinuxfs3) are retiring: upgrade your apps now!​

The base OS image used by your Cloud.​gov applications is called a "stack". The stack we’ve provided to date is called cflinuxfs3, and it’s based on Ubuntu 18.04 LTS, released originally in mid 2018 with continuous security updates since then. cflinuxfs4 is a new OS image based on Ubuntu 22.04 LTS, and is now default stack in Cloud.​gov. Ubuntu 18.04 will likely no longer receive security updates in May, so we will stop supporting cflinuxfs3 in Cloud.​gov May 10th.