"iwlwifi 0000:04:00.0: Microcode SW error detected. Restarting 0x12000000." at boot

Hi, could you attach output of `sudo lspci -vvnn` as well as full dmesg?

here dmesg output

and lspci output, I hope it could help

Hi, first, it seems to be affected by bug 1846016 as well, so could you install kernel from https://launchpad.net/~vicamo/+archive/ubuntu/ppa-1846016 and attach dmesg again. Thank you.

It also seems to be a duplicate of bug 1847643, which has a different adapter so not really sure so far.

Unfortunately, after adding your PPA no update is offered..
It is probably because I updated to official 5.3.0.19 kernel earlier today...

problem remains the same.
I am attaching new dmesg & lspci

I've pushed a new version to the same PPA based on 5.3.0-19. Please have an update and give it a try.

still nothing offered as install candidate:

corresponding line in apt update:
------------------------------------
Hit:3 http://ppa.launchpad.net/vicamo/ppa-1846016/ubuntu eoan InRelease

installed packages containing "linux-"
------------------------------------
ii binutils-x86-64-linux-gnu 2.33-2ubuntu1 amd64 GNU binary utilities, for x86-64-linux-gnu target
ii liblinux-epoll-perl 0.016-1 amd64 perl epoll module for O(1) multiplexing
ii linux-base 4.5ubuntu2 all Linux image base package
ii linux-firmware 1.183 all Firmware for Linux kernel drivers
ii linux-generic 5.3.0.19.22 amd64 Complete Generic Linux kernel and headers
ii linux-headers-5.3.0-18 5.3.0-18.19 all Header files related to Linux kernel version 5.3.0
ii linux-headers-5.3.0-18-generic 5.3.0-18.19 amd64 Linux kernel headers for version 5.3.0 on 64 bit x86 SMP
ii linux-headers-5.3.0-19 5.3.0-19.20 all Header files related to Linux kernel version 5.3.0
ii linux-headers-5.3.0-19-generic 5.3.0-19.20 amd64 Linux kernel headers for version 5.3.0 on 64 bit x86 SMP
ii linux-headers-generic 5.3.0.19.22 amd64 Generic Linux kernel headers
ii linux-image-5.3.0-18-generic 5.3.0-18.19+1 amd64 Signed kernel image generic
ii linux-image-5.3.0-19-generic 5.3.0-19.20 amd64 Signed kernel image generic
ii linux-image-generic 5.3.0.19.22 amd64 Generic Linux kernel image
ii linux-libc-dev:amd64 5.3.0-19.20 amd64 Linux Kernel Headers for development
ii linux-modules-5.3.0-18-generic 5.3.0-18.19 amd64 Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
ii linux-modules-5.3.0-19-generic 5.3.0-19.20 amd64 Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
ii linux-modules-extra-5.3.0-18-generic 5.3.0-18.19 amd64 Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
ii linux-modules-extra-5.3.0-19-generic 5.3.0-19.20 amd64 Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
ii linux-signed-generic 5.3.0.19....

You can install my prebuilt kernel with following command:

  $ sudo apt install --no-install-recommends linux-headers-5.3.0-17-generic=5.3.0-17.18+lp1846016 linux-modules-extra-5.3.0-17-generic=5.3.0-17.18+lp1846016

To list what packages are available for install, you can use `apt policy`:

  $ apt policy linux-headers-*
  linux-headers-5.3.0-17:
    Installed: 5.3.0-17.18+lp1846016
    Candidate: 5.3.0-17.18+lp1846016
    Version table:
   *** 5.3.0-17.18+lp1846016 500
          500 http://ppa.launchpad.net/vicamo/ppa-1846016/ubuntu eoan/main amd64 Packages
          100 /var/lib/dpkg/status
  ...

To install packages of a specific version, append '=<version>' after the package's name.

You'll have to select the right kernel to boot in the grub menu because it's not the latest one installed in your system.

Hi, I followed your instructions and installed 5.3.0-17.18+lp1846016. I didn't see any errors during boot just blinking cursor in left upper corner of display. However boot took probably same long time as when there were errors and, as I wrote, screen was black with blinking cursor instead of standard Ubuntu booting screen. I am attaching requested files

"uname -a" output
------------------------------------
Linux p50 5.3.0-17-generic #18+lp1846016-Ubuntu SMP Fri Oct 4 14:18:23 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

and dmesg