# Release Notes: Mitto Version 2.9.0

# Breaking Changes

1. Before upgrading an existing Mitto system with `mitto upgrade`,
   `javac` must first be installed.  This can be done via:
   ```
   sudo apt install openjdk-8-jdk-headless
   ```

   This step is *not* necessary when running Mitto in a cloud provider
   image built with `packer` using Mitto release `2.9.0-rc3` or later.

   When running the `apt install` command, if errors are encountered
   reconfiguring the `mitto` package, it may mean that Mitto was not
   fully installed prior to running `apt install`.  If such errors occur,
   running `mitto upgrade`, despite the `apt install` errors, may
   resolve the errors.

.. mdinclude:: 2.9.0-issues.md