OK, I have this tested again with OS installed on the NVME.

It looks like something in the userspace is the cause:
::::::::::::::
4.15.0-20-generic-analyze
::::::::::::::
Startup finished in 8.429s (firmware) + 3.576s (loader) + 2.412s (kernel) + 
23.634s (userspace) = 38.052s
graphical.target reached after 23.627s in userspace
::::::::::::::
4.15.0-30-generic-analyze
::::::::::::::
Startup finished in 8.268s (firmware) + 3.529s (loader) + 2.879s (kernel) + 
23.184s (userspace) = 37.861s
graphical.target reached after 23.164s in userspace
::::::::::::::
4.15.0-42-generic-analyze
::::::::::::::
Startup finished in 8.252s (firmware) + 3.513s (loader) + 1.957s (kernel) + 
23.106s (userspace) = 36.829s
graphical.target reached after 23.087s in userspace
::::::::::::::
4.15.0-45-generic-analyze
::::::::::::::
Startup finished in 8.257s (firmware) + 3.528s (loader) + 1.982s (kernel) + 
23.070s (userspace) = 36.837s
graphical.target reached after 23.050s in userspace
::::::::::::::
4.15.0-46-generic-analyze
::::::::::::::
Startup finished in 9.794s (firmware) + 3.805s (loader) + 2.984s (kernel) + 
41.040s (userspace) = 57.625s
graphical.target reached after 24.048s in userspace
::::::::::::::
4.15.0-47-generic-analyze
::::::::::::::
Startup finished in 9.950s (firmware) + 3.694s (loader) + 3.074s (kernel) + 
41.436s (userspace) = 58.156s
graphical.target reached after 23.965s in userspace


>From a side-by-side comparison, it's fwupd.service:
==> 4.15.0-42-generic-blame <==
         20.720s plymouth-quit-wait.service
          6.037s NetworkManager-wait-online.service
          4.667s bolt.service

==> 4.15.0-45-generic-blame <==
         20.682s plymouth-quit-wait.service
          6.037s NetworkManager-wait-online.service
          4.466s bolt.service

==> 4.15.0-46-generic-blame <==
         26.178s fwupd.service
         20.367s plymouth-quit-wait.service
          6.220s NetworkManager-wait-online.service

==> 4.15.0-47-generic-blame <==
         26.287s fwupd.service
         20.386s plymouth-quit-wait.service
          6.208s NetworkManager-wait-online.service


** Summary changed:

- Feedback on the Dell G7 7588 Boot Time
+ fwupd.service causing boot time increase since 4.15.0-46 on Dell G7 7588

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1821027

Title:
  fwupd.service causing boot time increase since 4.15.0-46 on Dell G7
  7588

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hi Ubuntu Team,
  My laptop take more than 45 sec to boot up Ubuntu. Here is my kernel log.

  
  Feb  5 13:26:57 my-laptop kernel: [    2.461535] input: SynPS/2 Synaptics 
TouchPad as /devices/platform/i8042/serio1/input/input6
  Feb  5 13:26:57 my-laptop kernel: [    2.780579] [drm] RC6 on
  Feb  5 13:26:57 my-laptop kernel: [   33.565700] SGI XFS with ACLs, security 
attributes, realtime, no debug enabled
  Feb  5 13:26:57 my-laptop kernel: [   33.567361] XFS (nvme0n1p10): Mounting 
V5 Filesystem

  
  Here is the problem. It take more than 30 sec to do load the kernel.

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