Public bug reported:

Mar 09 10:33:40 MDAT-DVT2-D8 kernel: FAT-fs (sda1): unable to read boot sector 
to mark fs as dirty
Mar 09 11:04:25 MDAT-DVT2-D8 kernel: iwlwifi 0000:00:14.3: Microcode SW error 
detected. Restarting 0x0.
Mar 09 11:04:25 MDAT-DVT2-D8 kernel: iwlwifi 0000:00:14.3: Start IWL Error Log 
Dump:
Mar 09 11:04:25 MDAT-DVT2-D8 kernel: iwlwifi 0000:00:14.3: Transport status: 
0x0000004B, valid: 6
Mar 09 11:04:25 MDAT-DVT2-D8 kernel: iwlwifi 0000:00:14.3: Loaded firmware 
version: 63.c04f3485.0 QuZ-a0-hr-b0-63.ucode
Mar 09 11:04:25 MDAT-DVT2-D8 kernel: iwlwifi 0000:00:14.3: 0x00000FAD | 
ADVANCED_SYSASSERT          
Mar 09 11:04:25 MDAT-DVT2-D8 kernel: iwlwifi 0000:00:14.3: 0x0000A210 | 
trm_hw_status0
Mar 09 11:04:25 MDAT-DVT2-D8 kernel: iwlwifi 0000:00:14.3: 0x00000000 | 
trm_hw_status1
Mar 09 11:04:25 MDAT-DVT2-D8 kernel: iwlwifi 0000:00:14.3: 0x004CAD42 | 
branchlink2
Mar 09 11:04:25 MDAT-DVT2-D8 kernel: iwlwifi 0000:00:14.3: 0x004C17C6 | 
interruptlink1
Mar 09 11:04:25 MDAT-DVT2-D8 kernel: iwlwifi 0000:00:14.3: 0x004C17C6 | 
interruptlink2
...

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.14.0-1027-oem 5.14.0-1027.30
ProcVersionSignature: Ubuntu 5.14.0-1027.30-oem 5.14.21
Uname: Linux 5.14.0-1027-oem x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Mar  9 11:13:53 2022
InstallationDate: Installed on 2021-10-19 (140 days ago)
InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
SourcePackage: linux-signed-oem-5.14
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux-signed-oem-5.14 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Summary changed:

- iwlwifi micrcode crash after updating to 5.14.0-1027-oem
+ iwlwifi microcode crash after updating to 5.14.0-1027-oem

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https://bugs.launchpad.net/bugs/1964286

Title:
  iwlwifi microcode crash after updating to 5.14.0-1027-oem

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