Best working Networkcard PCNet-FAST III
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I tried with Intel PRO/1000 MT Desktop (82540EM)
with Intel PRO/1000 T Server (82543GC)
with Intel PRO/1000 MT Server (82545EM)
and all of them downloaded the bootimage via TFTP only partitial and stuck many times.
Before you can use any of the Netboot Products you should download the Operating System Image to the /iso/ subdirectory of the product.
After installing Linux Mint 21.2 the system is running but no OPSI Client installed. → searching for the problem. Because at the end, opsi-clientagent-linux should be installed.