Unable to Change GRUB Settings in 20.04 LTS

I’ve been trying to change the GRUB settings on my Lubuntu 20.04 LTS install without any luck. I’ve tried both Grub Custromizer and manually editing /etc/default/grub followed by update-grub but the changes never take effect. Specifically, I’m trying to change the default timeout of 30 seconds to 5 seconds. Any suggestions?

I found it was related to the “recordfail” timeout? I added GRUB_RECORDFAIL_TIMEOUT=“5” to /etc/default/grub and ran update-grub and now it times out after 5 seconds. Unsure why I had to do this rather than just GRUB_TIMEOUT but at least I’ve been able to resolve it.

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