Raspberry Pi Installation Help?

[meda20]

@Nachteule - Thank you, I used the advice to RPi 2B boot from USB successfully.
I guess I don't always use the same version, I found the root parameter in two variations:
root=UUID=d2c25bab-1936-4c1b-b309-8fcaead6e413
and
root=/dev/mmcblk0p2
In the /etc/fstab file
I don't find an entry similar to /dev/mmcblk0p2
but I tried adding the line - although I don't know if it is needed.