Adding to the above #4, when I start the system, and before logging into
ubuntu 18.04 LTS with my username and password. I opened up the console
view (tty4). While shutdown down from there and reboot also works fine.
I recieve no messages of cpu worker stuck as described above. I think
its some other service which hangs the cpu workers(cpu resource
deadlock) which starts after logging into the system for the first time.
Since its a new laptop I have not installed apps or services to start
with init.d and also I have put no triggers for /etc/rc*
bluetooth/screen settings.

After this I tried installing nvidia drivers for gtx 1050 ti from nvidia
site run file I downloaded and it gave an error for nouveau kernel
driver. So I turned it off by nvidia's installer helper for this and
updated ramfs and did a reboot.

No issues for me now, for shutdown/reboot or random system hang after
successfully running nvidia graphics.

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   [Dell Inspiron 7577] shutdown/reboot hangs

Status in linux package in Ubuntu:

Bug description:

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-22-generic 4.15.0-22.24
  ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
  Uname: Linux 4.15.0-22-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.1
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Jun  1 01:19:51 2018
  InstallationDate: Installed on 2018-05-30 (0 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  SourcePackage: linux-signed
  UpgradeStatus: No upgrade log present (probably fresh install)

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