I am encountering a similar issue on a new Dell G5 5587. I've installed
Ubuntu 18.10 (fresh download today) alongside Windows 10 on a 1TB nvme

I can boot into Ubuntu, but the system hangs shortly after boot, usually
less than 5 minutes.  I have not determined what specifically triggers
the hanging.  I have noticed that it does not happen all at once. By
that I mean that I lose mouse first (touchpad and wireless mouse), but I
can still use the keyboard (sometimes) for a few seconds after the mouse
is gone. This makes me wonder if the system is actually frozen or if
there is just no HID being recognized.  I've also seen the system "lag"
input from the keyboard: no response immediately but 30-40 seconds later
characters that I typed will appear. I also notice that the fans kick on
high, so there may be a runaway processes.

In the current state 18.10 is unusable. I haven't even been able tail
the log files, I encounter the hang before I have time to troubleshoot
the issue. I'm not sure if it's the same issue or something specific to
my hardware, I'll update as I continue to try to troubleshoot.

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  Random unrecoverable freezes on Ubuntu 18.10

Status in linux package in Ubuntu:
Status in linux source package in Bionic:
Status in linux source package in Cosmic:
Status in linux source package in Disco:

Bug description:
  First thing I notice is that the mouse cursor freezes as I'm using it,
  then I hit the CAPS LOCK key and the LED indicator doesn't respond.
  Then I try the "REISUB" command, but it doesn't do anything either.
  Only a hard reset works, pressing down the power button for a few

  How to reproduce?
  I couldn't figure out a consistent method. It is still random to me.

  Version: Ubuntu 4.18.0-10.11-generic 4.18.12
  System information attached.

  Also happens under Arch Linux and Fedora.
  I've talked to another user on IRC who seems to be having the same freezes.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.18.0-10-generic 4.18.0-10.11
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
  Uname: Linux 4.18.0-10-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13
  Architecture: amd64
   /dev/snd/controlC1:  dsilva     1213 F.... pulseaudio
   /dev/snd/controlC0:  dsilva     1213 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Sat Oct 20 09:54:50 2018
  InstallationDate: Installed on 2018-10-20 (0 days ago)
  InstallationMedia: Xubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
  MachineType: Dell Inc. Inspiron 5458
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-10-generic 
root=/dev/mapper/xubuntu--vg-root ro quiet splash vt.handoff=1
   linux-restricted-modules-4.18.0-10-generic N/A
   linux-backports-modules-4.18.0-10-generic  N/A
   linux-firmware                             1.175
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/02/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  dmi.board.name: 09WGNT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.product.name: Inspiron 5458
  dmi.product.sku: Inspiron 5458
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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