Kubuntu won't boot

[Callisto]

This is mine:

BootCurrent: 0001
Timeout: 0 seconds
BootOrder: 0001,2001,2002,2003
Boot0000* Unknown Device:
Boot0001* Kubuntu
Boot0002* Unknown Device:
Boot0003* Unknown Device:
Boot0004* Unknown Device:
Boot0005* Unknown Device:
Boot0006* Unknown Device:
Boot0007* Unknown Device:
Boot0008* Unknown Device:
Boot0009* Unknown Device:
Boot000A* Unknown Device:
Boot000B* Unknown Device:
Boot000C* Unknown Device:
Boot000D* Unknown Device:
Boot000E* ubuntu
Boot2001* EFI USB Device
Boot2002* EFI DVD/CDROM
Boot2003* EFI Network

I do not know why so many unknown devices. It says Kubuntu because when I said to trust shimx64.efi, it asked me to give a name, and I wrote Kubuntu.

[Callisto]

Yesterday I tried telling efibootmgr to boot from "ubuntu", but it didn't work, it showed me always the USB drive.

[Qqmike]

[FONT=monospace]BootOrder: 0001,2001,2002,2003 
Boot0001* [B]Kubuntu[/B] [/FONT]

That works. I've never seen an entry for Kubuntu, though (unless the user creates it manually). Usually any Ubuntu derivative OS (K(U)buntu, Mint, Xubuntu, etc.) all share the same directory /efi/boot/EFI/ubuntu.

[Qqmike]

it asked me to give a name, and I wrote Kubuntu.

Ah, nice!

[Qqmike]

Yesterday I tried telling efibootmgr to boot from "ubuntu", but it didn't work, it showed me always the USB drive.

That instance of "ubuntu" may have been the USB flash drive installer for Kubuntu? (which would now be unplugged)

[Qqmike]

I do not know why so many unknown devices.

I don't know, either. It is not uncommon for the firmware to accumulate a bunch of entries that seem cryptic or are no longer relevant or in use. I just ignore them.

Re-booting sometimes solves some of these strange happenings