KDE Neon 24.04 won't boot

Help
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I recently upgraded my laptop running neon to 24.02. The ugrade went smoothly without any errors but after restart, the machine would not boot. I read on these forums that there is now a new entry in BIOS that needs to be selected. In my BIOS I see 3 options to boot:

  1. KDE neon
  2. ubuntu
  3. UEFI NVMe Samsung…

There used to be another option named “neon”. I deleted that as it was from a previous installation. “ubuntu” was always there as well and I don’t know what it is doing. I have had success booting the machine by choosing “UEFI NVMe Samsung…” option a couple of times but now I can’t even do that. No matter which option I pick, the machine just goes blank and does not boot to KDE.

Please help me fix this. Within my BIOS, I see an option to add additional boot devices. I have to go through a file menu and pick a file. The options are grubx64.efi, shimx64.efi, mmx64.efi, BOOTX64.CSV and grub.cfg. Which one should I use?

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After playing around with all the options and getting nowhere, I finally stumbled upon this post: https://www.reddit.com/r/kdeneon/comments/1g3r9rv/upgrade_completly_borked_my_system/

Downloading the boot-repair-disk ISO and doing the recommended repair did the trick for me. I did not have to remove splash from /etc/default/grub.

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Thank you! Brilliant resource.

I think removing the splash option has helped in my case. Sadly does mean I miss on on the slick af splash screens for Neon, but even so it feels way faster to boot than before anything broke too.

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The easiest way to fix that would have been to boot the Live USB, open a terminal and type “efibootmgr”. In there you will see the same entries in your bios menu. If Neon is the only OS installed on the system, then you could have safely deleted the entry “Ubuntu” which was what was likely causing the system to not boot. You should be left with one entry labeled “KDE Neon” and one “UEFI OS” (or the label) for the Live USB. It should have booted fine after that.