I also have had random system freezes ever since I upgraded from 18.04
to 18.10, Linux 4.18.0-10-generic, solved by always booting into
4.15.0-36-generic. When the freezes happen, the screen simply stops, and
no input is accepted, not even the usual REISUB.

teresaejunior@laptop ~> inxi -Fz
System:    Host: laptop Kernel: 4.15.0-36-generic x86_64 bits: 64 Desktop: Xfce 
4.13.2 
           Distro: Ubuntu 18.10 (Cosmic Cuttlefish) 
Machine:   Type: Laptop System: LENOVO product: 80JE v: Lenovo G40-80 serial: 
<filter> 
           Mobo: LENOVO model: Lancer 4A1 v: SDK0E50515 STD serial: <filter> 
UEFI: LENOVO v: B0CN79WW 
           date: 05/07/2015 
Battery:   ID-1: BAT0 charge: 26.4 Wh condition: 26.4/28.5 Wh (93%) 
CPU:       Topology: Dual Core model: Intel Core i5-5200U bits: 64 type: MT MCP 
L2 cache: 3072 KiB 
           Speed: 1397 MHz min/max: 500/2700 MHz Core speeds (MHz): 1: 1146 2: 
1000 3: 1079 4: 1039 
Graphics:  Device-1: Intel HD Graphics 5500 driver: i915 v: kernel 
           Display: x11 server: X.Org 1.20.1 driver: modesetting unloaded: 
fbdev,vesa resolution: 1366x768~60Hz 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 5500 (Broadwell GT2) v: 
4.5 Mesa 18.2.2 
Audio:     Device-1: Intel Broadwell-U Audio driver: snd_hda_intel 
           Device-2: Intel Wildcat Point-LP High Definition Audio driver: 
snd_hda_intel 
           Sound Server: ALSA v: k4.15.0-36-generic 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
driver: r8169 
           IF: enp2s0 state: down mac: <filter> 
           Device-2: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter 
driver: ath9k 
           IF: wlp3s0 state: up mac: <filter> 
           Device-3: Atheros AR3012 Bluetooth 4.0 type: USB driver: btusb 
           IF-ID-1: docker0 state: down mac: <filter> 
Drives:    Local Storage: total: 931.51 GiB used: 411.53 GiB (44.2%) 
           ID-1: /dev/sda vendor: Seagate model: ST1000LM024 HN-M101MBB size: 
931.51 GiB 
Partition: ID-1: / size: 915.71 GiB used: 411.52 GiB (44.9%) fs: ext4 dev: 
/dev/sda2 
Sensors:   System Temperatures: cpu: 41.0 C mobo: N/A 
           Fan Speeds (RPM): N/A 
Info:      Processes: 267 Uptime: 7h 12m Memory: 11.64 GiB used: 3.45 GiB 
(29.7%) Shell: fish inxi: 3.0.24

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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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