We are upgrading the OS to Ubuntu Bionic in order to keep the Basic environment current and supportable.
Beginning February 18th we will begin gradually running builds on Bionic. For many projects, this will be an uneventful change and your builds will just work.
For projects with custom configurations, we expect you will need to make some adjustments to get your builds running on Bionic. If you need to opt-out of this change you can visit the General tab under Project Settings. Please contact our support team at firstname.lastname@example.org for assistance with any migration challenges.
Bionic builds are already available, so if you would like to get started now, just let us know. Thanks, and as always let us know if you have any questions!