How to remove the Ubuntu Touch kernel at startup?

Question

I have tried the latest Ubuntu Touch on Nexus 5, but it was useless because an exential app doesn't work with Anbox.
So i want to try an Lineage 18.1 unofficial image.
I have installed the image with no problems.
But I cannot remove/erase the ubuntu kernel at start.
I have tried those commands


fastboot flash bootloader android/roms/twrp-3.3.1-0-hammerhead.img 

Sending 'bootloader' (13290 KB)

  OKAY [  0.640s]

Writing 'bootloader'

 FAILED (remote: 'invalid bootloader image

')

fastboot: error: Command failed



fastboot flash recovery2 android/roms/twrp-3.3.1-0-hammerhead.img 

Sending 'recovery2' (13290 KB)

OKAY [  0.640s]

Writing 'recovery2'

  FAILED (remote: 'partition table doesn't exist')

fastboot: error: Command failed



fastboot erase bootloader

Erasing 'bootloader'

 FAILED (remote: 'Partition table doesn't exist

')

fastboot: error: Command failed

How to remove the kernel at startup?


— elbarna | Sources

Answer

Solution found, works on Linux. The phone in example in Nexus 5 so you had to adapt to YOUR phone.
WARNING: , I am not responsible for any kind of damage to your phone, follow this solution at your own risk.
Connect the phone to usb port of a Linux pc, called "host", all commands must be run from this pc.


a)Download the factory image for Nexus 5 then connect the phone to pc WARNING: IS FOR NEXUS 5 HAMMERHEAD, you MUST select another image if use another phone.


ensure this command return the right thing


fastboot device

b)then extract the zip image, enter in the dir created and run


sh flash-all.sh

from the computer host


It will reboot in the factory image of Android 4(sic!) and then you can install Ubuntu touch or a "free" Android rom.


— elbarna | Sources

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