Ubuntu 20.04 packaging and testing work is planned for the MongoDB 4.4 release cycle.
Depending on your system architecture, relevant issues to watch for updates are:
- SERVER-44070: Add Community & Enterprise Ubuntu 20.04 x64
- SERVER-44071: Add Community & Enterprise Ubuntu 20.04 ARM
I cannot currently offer more precise timing, but issue states in Jira will change as work progresses. For example, SERVER-44070 for x64 platform support is currently in progress.
We typically do not create new packages and test environments for O/S releases that predate a MongoDB server release, so I would not expect MongoDB 4.0 or 4.2 packages for Ubuntu 20.04.
Regards,
Stennie