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Why don't Intel microcode updates work on my system?
March 18, 2018
Edited: March 18, 2018
September 20, 2023
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Bug in Meltdown/Spectre Intel Microcode
There was a bug in early 2018 Intel Microcode update to address Meltdown/Spectre security holes. As such the microcode had to be rolled back to a previous version.
Here is the microcode I’m using (having opted out of all updates starting January 2018):
$ apt list --installed | grep intel-microcode WARNING: apt does not have a stable CLI interface. Use with caution in scripts. intel-microcode/now 3.20170707.1~ubuntu16.04.0 amd64 [installed,upgradable to: 3.20180108.0+really20170707ubuntu16.04.1]
When you install Intel Microcode Update you will get this version or something similar:
Ubuntu 16.04 LTS Menu
I’m not sure about Lubuntu menu structure but for regular Ubuntu this is how you access the Intel Microcode Update controls:
The bottom option controls Intel Microcode Updates.
Install Intel Microcode from CLI
To skip the GUI menus altogether you can install from command line:
sudo apt update sudo apt install intel-microcode
dmesg now shows correct output
After following the installation steps
dmesg returns the desired output (unlike in your question where it shows nothing):
$ dmesg | grep -i microcode [ 1.166542] microcode: sig=0x506e3, pf=0x20, revision=0xba [ 1.166993] microcode: Microcode Update Driver: v2.2. [16082.584598] microcode: microcode updated early to revision 0xba, date = 2017-04-09