Public bug reported:

[Impact] 
Thunderbolt updates posted to LVFS fail to install

[Test Case]
On an XPS 9360 (Only system currently published with TBT FW update).
1) fwupdmgr refresh
2) fwupdmgr update
3) Observe no errors

If TBT update already applied, please manually download from LVFS and follow 
these steps
1) fwupdmgr install <blah.cab> --allow-reinstall

[Regression potential]
Low, only affects Dell machines

[Other info]
fwupd 0.9.7 has support for doing thunderbolt firwmare updates.
Thunderbolt controllers will go to sleep if not in use (No TBT device 
connected).
fwupd 0.9.7 has a special way to wake up dell TBT controllers, that's where 
this problem is.
It doesn't happen if TBT device connected when update is run
fwupd 1.0.2 (in bionic) will not be affected.  it wakes TBT controller using a 
different interface over WMI

** Affects: fwupd (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: fwupd (Ubuntu Artful)
     Importance: Undecided
         Status: New

** Affects: fwupd (Ubuntu Bionic)
     Importance: Undecided
         Status: Invalid

** Also affects: fwupd (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Also affects: fwupd (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: fwupd (Ubuntu Bionic)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1741509

Title:
  Thunderbolt updates on Dell systems fail to apply if nothing connected

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