Upgrade the TBT NVM to 28.0.
I can observe the same symptom on *some* USB Type-C devices get plugged to TBT 
port.
Plug the same device to the non-TBT port, it works correctly.

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Kai-Heng Feng (kaihengfeng)

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https://bugs.launchpad.net/bugs/1745747

Title:
  No USB support for Dell XPS 13 9370 running Bionic 18.04

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