I tried to upgrade KDE Neon to the lastest version (Based Ubuntu 18.04 to 20.04).

First i couldn't start the upgrade, because it says, that I should update some packages, even I updated all, I had to disable a couple of sources, so that I only have left the neon sources:

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deb http://archive.neon.kde.org/user/ bionic main
deb-src http://archive.neon.kde.org/user/ bionic main


Now I can start the upgrade, but I breaks on updating with the following error:

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Hold prevents MarkGarbage of intel-microcode:amd64 < 3.20180312.0~ubuntu18.04.1 | 3.20200609.0ubuntu0.20.04.2 @hi uH >
Log time: 2020-10-27 13:24:31.695861

Any ideas?

And if you remove the microcode?

I could solve it now. I had to reactive some of the sources. It was more or less a try and error experiment.