@Boris Gjenero, try using the kernel parameter "iommu=soft" instead of
limiting the memory to 1GB. It will force the use of a 64MB swiotlb
bounce buffer to workaround this issue. Tested with Focal Fossa Beta ISO
(Kernel 5.4.0-21-generic) on my Optiplex 320 with 2GB of RAM.

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https://bugs.launchpad.net/bugs/1821564

Title:
  b44 Ethernet driver null pointer during initialization

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