Hello, if you can't resolve initrd or other errors, I recommend porting with Xenial 16.04 instead of Focal 20.04. Xenial 16.04 generally uses 4.x kernels, and most Samsung devices in Ubuntu Touch ports are ported on Xenial 16.04 (except for the Samsung S7, which supports 20.04). This might also resolve initrd and other errors.

What is your problem İnitrd failed or Lomiri start error