I have the same problem very often during a day on a Lenovo ThinkCentre
M900 (see specs below).

Often this problem is preceded by Chrome tabs blinking or blacking out
but I can't be sure it is a related problem. In those cases, the only
solution is to kill Chrome and restart the application.

When Ubuntu freezes it starts with either a frozen cursor or unable to
use the cursor anywhere. Other times Ubuntu becomes very slow before
freezing.

    product: 10FCS22R00 (LENOVO_MT_10FC_BU_LENOVO_FM_ThinkCentre M900)
       product: 30BC
          product: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
             product: M378A1K43CB2-CRC
             product: M378A1K43CB2-CRC
          product: Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host 
Bridge/DRAM Registers
             product: Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe 
Controller (x16)
                product: GK208B [GeForce GT 720]
                product: GK208 HDMI/DP Audio Controller
             product: 100 Series/C230 Series Chipset Family USB 3.0 xHCI 
Controller
             product: 100 Series/C230 Series Chipset Family MEI Controller #1
             product: Q170/Q150/B150/H170/H110/Z170/CM236 Chipset SATA 
Controller [AHCI Mode]
             product: Q170 Chipset LPC/eSPI Controller
             product: 100 Series/C230 Series Chipset Family Power Management 
Controller
             product: 100 Series/C230 Series Chipset Family HD Audio Controller
             product: 100 Series/C230 Series Chipset Family SMBus
             product: Ethernet Connection (2) I219-LM
             product: SanDisk SD8SB8U5
             product: DVD-RW DH16AFSH
             product: BUP Slim RD
       product: To Be Filled By O.E.M.

** Attachment added: "Screenshot from 2018-12-18 09-42-02.png"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1798961/+attachment/5223255/+files/Screenshot%20from%202018-12-18%2009-42-02.png

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1798961

Title:
  Random unrecoverable freezes on Ubuntu 18.10

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

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
  seconds.

  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
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /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 
(20181017.2)
  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
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-10-generic N/A
   linux-backports-modules-4.18.0-10-generic  N/A
   linux-firmware                             1.175
  RfKill:
   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.modalias: 
dmi:bvnDellInc.:bvrA15:bd02/02/2018:svnDellInc.:pnInspiron5458:pvr01:rvnDellInc.:rn09WGNT:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Inspiron 5458
  dmi.product.sku: Inspiron 5458
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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