Public bug reported:

I was running Ubuntu 20.04 on a B550 motherboard.

I believe the 2.5gb ethernet is actually only in newer kernels normally
but Ubuntu backport it.

It was working fine, then I received a kernel upgrade 5.4.0-53 and the
ethernet dissapeared.

If I use grub to boot into the old kernel 5.4.0-52 the ethernet is there
still so it appears to be the newer kernel.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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https://bugs.launchpad.net/bugs/1904102

Title:
  Upgrade from 5.4.0-52 to 5.4.0-53 lost 2.5gbe ethernet on B550 board

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I was running Ubuntu 20.04 on a B550 motherboard.

  I believe the 2.5gb ethernet is actually only in newer kernels
  normally but Ubuntu backport it.

  It was working fine, then I received a kernel upgrade 5.4.0-53 and the
  ethernet dissapeared.

  If I use grub to boot into the old kernel 5.4.0-52 the ethernet is
  there still so it appears to be the newer kernel.

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