8 to 9 | amd64-microcode warning

[Red56]

Prior to the upgrade from 8.4.8 to Proxmox 9.0 I ran the pve8to9 -- full command
Everything looks almost ok, except one warning:

Package amd64-microcode is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'amd64-microcode' has no installation candidate
---

Can you tell how I can force this 'other package' to update the amd64-microcode package?
Thanks, Jos

 

[Impact]

See docs on how to install it.

 

[Red56]

That link sure raised my learning curve - thanks for that!
Issue remains - will dive deeper into this and let you know.

 

[onefish2]

The amd64-microcode package does not seem to be in the repos. I checked a Debian 12 and a Debian 13 Vm they do not seem to be there either.

 

[onefish2]

The amd64-microcode package does not seem to be in the repos. I checked a Debian 12 and a Debian 13 Vm they do not seem to be there either.

To be able to install packages from this component, run editor /etc/apt/sources.list, append non-free-firmware to the end of each .debian.org repository line and run apt update.

 

[Red56]

I did, but no result:
Hit:1 http://ftp.nl.debian.org/debian bookworm InRelease
Hit:2 http://ftp.nl.debian.org/debian bookworm-updates InRelease
Hit:3 http://security.debian.org bookworm-security InRelease
Hit:4 https://enterprise.proxmox.com/debian/pve bookworm InRelease
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.

Does anyone know who I have to contact to have that amd64-microcode package in the Debian 12 repo (which I currently in) and Debian 13 one?

 

[onefish2]

The you have to install the amd64-microcode package.

 

[juliokele]

Solution is hier:

J

Post in thread 'Proxmox Virtual Environment 9.0 released!'

Aug 5, 2025

Upgrade was smooth but i found this warning, how can i fix it?

Error: Package 'intel-microcode' has no installation candidate

View attachment 88891

Check your /etc/apt/sources.list.
It should end with "main non-free contrib non-free-firmware" all the debian.org deb section.

for example:
deb http://ftp.de.debian.org/debian trixie main non-free contrib non-free-firmware

deb http://ftp.de.debian.org/debian trixie-updates main non-free contrib non-free-firmware

deb http://security.debian.org trixie-security main non-free contrib non-free-firmware

• juliokele

• 

 

[V3nom]

See docs on how to install it.

Thanks that worked. Added the component "non-free-firmware" to /etc/apt/sources.list.d/debian.sources, then updated my sources and was able to install it.

 

[DarthMich]

Hello,

Here is how /etc/apt/sources.list file shoud look like:

/etc/apt# cat sources.list
deb http://ftp.debian.org/debian bookworm main contrib non-free-firmware

deb http://ftp.debian.org/debian bookworm-updates main contrib non-free-firmware

# security updates
deb http://security.debian.org bookworm-security main contrib non-free-firmware

deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription

It installs correctly after that.

 

[V3nom]

It installs correctly after that.

You can use "apt modernize-sources" to convert your sources to the modern standard.

 

[DarthMich]

That was pre-upgrade, I let it as-is and ran apt modernize-sources after upgrade.
I noticed differences between recommend file content in ProxMox Wiki and what was copied over by modernize-sources (basically just the content of sources.list as is), so I kept only the recommended content.