How can I remove the boot screen image in Ubuntu Mate for the RPi4 so that I see the boot output text while the computer boots?
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Edit /etc/default/grub and comment out this line (add # as first char)
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
sudo update-grub then reboot
Thank you for taking the time to help. I'm sorry, I should have mentioned that the usual doesn't work - there is no etc/default/grub file. This is a Raspberry Pi - quite a lot is different to the Intel way.
You mentioned the OS as Ubuntu Mate.
If you're running Raspbian, then edit /boot/cmdline.txt and remove the same words from the boot command. Sample command below:
console=serial0,115200 console=tty1 root=PARTUUID=7635a043-02 rootfstype=ext4 fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
Thank you again! I am indeed running Ubuntu Mate.
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Possibly removing the words 'quiet' and 'splash' from /boot/firmware/cmdline.txt will do the trick
Thanks for the suggestion, it looked like a good possibility but doesn't work.
from my notes:
there is no grub for the pi, so boot parameters are set via
/boot/firmware/cmdline.txt
although there IS a file /etc/default/flash-kernel text file containing the
"standard" LINUX_KERNEL_CMDLINE= arg, it is NOT used. to disable the splash
screen and actually see the boot output, you need to edit
/boot/firmware/cmdline.txt
and remove the "splash" from THAT instead.
but I suspect that was while I was still running Raspbian.
There clearly IS something similar for Ubuntu though, as I'm now running that and at some point fixed the same issue there. I would suggest just running a recursive grep "splash" in /etc - I expect that's how I found the appropriate file in the Ubuntu install.
For those of you who don't want to hunt through man pages looking for how to do a "recursive grep", here's the quick command:
grep -r "splash" /etc