I have installed Ubuntu Core on my SD card and run it on a RPi 4 4GB of my school when I didn't have mine and I could run the installation procedure and boot the os with no issue.
But when I have tried the same SD card on my own one, it boots with this screen
I have also tried with a freshly downloaded image, and it showed the same screen. I have planned to use it as a companion computer with a Pixhawk autopilote and Ubuntu Core kind of seduce me for the use i have planned for it.
Is someone have a solution for it? Is it due to my bootloader version? I'll try the desktop version of Ubuntu in the meantime
Edit 11/04/2022: Ubuntu desktop from raspberry pi imager work but freeze when I try to run a command on the terminal
51 Answer
I have had the same issue with Ubuntu Core 20, on the same revision of the board. I eventually switched to Ubuntu Server (I didn't specifically need Core).
I didn't try copy the start.elf file across from the Git repo as per your last comment (Apr 13), because my firmware (bootloader and VL805_FW) are updated to version 1650968668, dated 2022-04-26 10:24 UTC. It's sufficiently after the commit date mentioned in that forum that it should be incorporated.
The URL in the error message is completely useless.
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