Public bug reported:

[Impact]
If you install Ubuntu onto USB storage behind a Platform USB host controller, 
it will not be able to boot because the generated initramfs will not include 
the host controller driver.

[Test Case]
Install to a USB stick attached to platform USB controller and reboot. Booting 
will fail because it will be unable to find the root file system.

[Regression Risk]
Driver is only loaded when system requires xhci-plat-hcd, minimizing the impact 
to all other systems.

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1649213

Title:
  Support rootfs on xhci-plat-hcd attached storage

Status in initramfs-tools package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Impact]
  If you install Ubuntu onto USB storage behind a Platform USB host controller, 
it will not be able to boot because the generated initramfs will not include 
the host controller driver.

  [Test Case]
  Install to a USB stick attached to platform USB controller and reboot. 
Booting will fail because it will be unable to find the root file system.

  [Regression Risk]
  Driver is only loaded when system requires xhci-plat-hcd, minimizing the 
impact to all other systems.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1649213/+subscriptions

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