Lubuntu 20.04(.01) - Linux Kernel update does not boot - 5.4.0-45 and 5.4.0-47

Recently there was a linux kernel update, 5.4.0-45.
With this kernel I cannot boot into Lubuntu, it halts with a intramfs> prompt.

Today there was a linux kernel update, 5.4.0-47.
The same issue.

I have to choose 5.4.0-42 to boot into Lubuntu.

I have a notebook HP 14-0200ng (Ryzen 3) and HP EX-900 M.2 SSD PCIe NVMe.

I was thinking to make a new installation of Lubuntu 20.04. Would that solve the problem?

Also I don’t know, if a new installation only provides the latest kernel, which currently doesn’t work, or if there are a few to choose from, for example also 5.4.0-42?
But at least I thought of trying to solve the issue with a new installation, but better to ask upfront.

It must be something similar to:

Today’s kernel update 5.4.0-47 came shortly after 5.4.0-45, it looks like it was ment to solve the issue with 5.4.0-45, but it doesn’t.

My Lubuntu version is (via lsb_release -a):
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal


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Please open a terminal and execute

{ sudo apt update && sudo apt full-upgrade && sudo apt install linux-generic; } | pastebinit

and share the URL here.

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If I execute:
{ sudo apt update && sudo apt full-upgrade && sudo apt install linux-generic } | pastebinit

it shows me a prompt “>”, nothing happens.

If I leave out the “{” and “}”, I get the following URL:

The URL shows:
Reading package lists…
Building dependency tree…
Reading state information…
linux-generic is already the newest version (
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

I booted with 5.4.0-42, why does it show the latest

Sorry, I am using another shell and did not test it with bash. Seems, that I forgot a ; (I have edited the post to correct it, for other people in the same situation).

linux-generic is a metapackage, which points always to the latest available kernel and kernel header.

It seems, that you have installed the kernel correctly, which is normally a good sign.

You can rebuild the initramfs with

sudo update-initramfs -u -k all

If there are no errors, reboot and try it again with the latest kernel.

If it does not boot, than we should check the log files:

journalctl -b -1 | pastebinit
sudo update-initramfs -u -k all
update-initramfs: Generating /boot/initrd.img-5.4.0-47-generic
update-initramfs: Generating /boot/initrd.img-5.4.0-45-generic
update-initramfs: Generating /boot/initrd.img-5.4.0-42-generic

No errors, will try to reboot.
After reboot with 5.4.0-47 same problem, it halted, some error messages were shown:

[0.593653] ACPI BIOS ERROR (bug): Could not resolve symbol [\_SB.PCI0.GPP2.BCM5, AE_NOT_FOUND (20190816/dswload2-162)

[0.593672] ACPI ERROR : AE_NOT_FOUND, During name lookup/catalog (20190816/psobject-220)

[0.818787] pci 0000:00:00.2: AMD-Vi : Unable to read/write to IOMMU perf counter.

[1.136798] tmp_crb MSFT0101:00 : can't request region for resource [mem 0x9d1^@

journalctl -b -1 | pastebinit

The log file is very long and it seems, that you were able to login and work as usual.

Only with 5.4.0-42, but not with 5.4.0-45 or 5.4.0-47.

Solved it by making an upgrade to Lubuntu 20.10
Boots fine with 5.8.0-18-generic

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Good. Please mark your answer as solution.

Don’t see an option to mark it as solution.