Fix KDE Neon boot problem by replacing its boot-partition with Kubuntu's

fuse-kde-neon-with-kubuntu-efi-boot.bash

#!/bin/bash
sudo apt-get install kpartx xorriso

# parameters to set before run
# download both kde-neon and kubuntu's image to fuse them (attach EFI+BootPartition to kde-neon's)
export KDE_NEON_IMG=/home/nima/neon-useredition-20190321-0530-amd64.iso
export KUBUNTU_IMG=/home/nima/kubuntu-18.04.2-desktop-amd64.iso

export KDE_NEON_NEW_IMG=$(basename $KDE_NEON_IMG | awk '{ gsub(/\.iso$/,"-modded.iso",$1); print $1 }')
export MOUNT=$(mktemp -d)

mkdir $MOUNT/kubuntu
mkdir $MOUNT/kubuntu-boot
mkdir $MOUNT/neon
mkdir $MOUNT/modded

# mount kubuntu iso main-partition to fetch EFI from it
sudo kpartx -v -a $KUBUNTU_IMG
export KUBUNTU_MAIN_DEV=$(sudo kpartx -l $KUBUNTU_IMG | head -n 1 | awk '{ print "/dev/mapper/"$1 }')
sudo mount $KUBUNTU_MAIN_DEV $MOUNT/kubuntu -o loop,ro

# mount kubuntu iso boot-partition to attach it to neon iso
export KUBUNTU_BOOT_DEV=$(sudo kpartx -l $KUBUNTU_IMG | tail -n 1 | awk '{ print "/dev/mapper/"$1 }')
sudo mount $KUBUNTU_BOOT_DEV $MOUNT/kubuntu-boot -o loop,ro
sudo dd if=$KUBUNTU_BOOT_DEV of=$MOUNT/kubuntu-boot.img

# mount neon iso to copy its files
sudo kpartx -v -a $KDE_NEON_IMG
export NEON_MAIN_DEV=$(sudo kpartx -l $KDE_NEON_IMG | head -n 1 | awk '{ print "/dev/mapper/"$1 }')
sudo mount $NEON_MAIN_DEV $MOUNT/neon -o loop,ro

# create mix = neon files (except EFI) + kubuntu's EFI
cp -R $MOUNT/neon/* $MOUNT/modded/
sudo rm -rf $MOUNT/modded/EFI
cp -R $MOUNT/kubuntu/EFI $MOUNT/modded/

# unmount + unmap + remove
sudo umount $MOUNT/neon
sudo umount $MOUNT/kubuntu-boot
sudo umount $MOUNT/kubuntu
sudo kpartx -v -d $KUBUNTU_IMG
sudo kpartx -v -d $KDE_NEON_IMG
rm -rf $MOUNT/kubuntu
rm -rf $MOUNT/kubuntu-boot
rm -rf $MOUNT/neon

# create a iso image and attach kubuntu's EFI BOOT partition to it
xorriso \
    -as mkisofs \
    -r -V kde-neon-fixed \
    -o $KDE_NEON_NEW_IMG \
    -J -J -joliet-long -cache-inodes \
    -b isolinux/isolinux.bin \
    -c isolinux/boot.cat \
    -boot-load-size 4 -boot-info-table -no-emul-boot \
    -eltorito-alt-boot \
    -e --interval:appended_partition_2:all:: \
    -append_partition 2 0xef $MOUNT/kubuntu-boot.img \
    -no-emul-boot -isohybrid-gpt-basdat \
    $MOUNT/modded/

# cleanup
rm -rf $MOUNT

Why the hell I did that? KDE-Neon's boot freezes (before it reaches grub) on my system but Kubuntu doesn't.