Add driver to PXE server

pe flag

I have a PXE server to automatically install ubuntu. with this configuration:

  1. GRAB config:
  2. UEFI
  3. vmlinuz and initrd from the official image of ubuntu 20.04 server

it became necessary to install the system with PCE on laptops, via USB - RJ45 this device uses a driver like this: I try to add it, but I get a panic kernel (VFS: Cannot open root device "ram0" or unknown-block(0,0): error -6 ) even if I rebuild the initrd without changing the files, I still get the panic kernel I rebuild it like this:

a) unpack the initrd:

b) added the /lib/modules/5.4.0-88-generic/kernel/drivers/net/usb folder

c) packed it back according to the instructions from here

cd initrd-test
find . | cpio -o -H newc > ../initrd-test.img
cd ..
gzip initrd-test.img
cp initrd-test.img.gz initrd-test.img

what am I doing wrong? can eat ready-made initrd? I found рwe-initrd on the ubuntu image, but it doesn't solve my problem sorry for my bad english

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