"Failed to check for processor microcode upgrades" at the end of apt-get. How can I fix this?

Question

I am using Ubuntu 21.04 Server on Raspberry Pi 4 (4GB RAM)

When I use apt to install a package, I get some messages at the end that I don't remember getting on my PC:

Processing triggers for man-db (2.9.4-2) ...
Scanning processes...
Scanning processor microcode...
Scanning linux images...
Running kernel seems to be up-to-date.
Failed to check for processor microcode upgrades.
No services need to be restarted.
No containers need to be restarted.
No user sessions are running outdated binaries.

I am concerned about the message "Failed to check for processor microcode upgrades."

Why could it be failing? How can I fix this?

Answer 1

All these messages came from needrestart application which purpose is

check which daemons need to be restarted after library upgrades

This application have several modules. The processor microcode module supports only AMD and Intel processors. So it knows nothing about ARM in the RaspberryPi, so it shows the mentioned error message.

If you do not want to get such messages, then remove this application by

sudo apt-get purge needrestart

or edit relevant configuration file at /etc/needrestart/needrestart.conf and disable microcode checks completely by changing

#$nrconf{ucodehints} = 0;

to

$nrconf{ucodehints} = 0;