5.6.0f1 asset upgrade Error: Can't find System.xml.dll

For those who face this issue during asset re-import after upgrading to the latest build. A simple fix - run from the command line:

sudo ln -s /opt/Unity/Editor/Data/Mono/lib/mono/2.0/System.Xml.dll /opt/Unity/Editor/Data/Mono/lib/mono/2.0/System.xml.dll

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What is incorrectly referencing System.xml.dll?

The Unity’s APIUpdater. See bug #895081 with repro project.

This still appears to be an issue. Unground’s workaround appears to help.

Also see earlier report: 5.6.0xf3Linux API Updater has a Typo