Installed Windows 10, then Fedora on the internal 256GB SSD, then Ubuntu on an external USB HDD. UEFI boot menu (F9) only shows Fedora and Ubuntu; Windows 10 does not show up. Running efibootmgr as root from Fedora shows as below. How to get Windows boot option back, preferably without wiping the SSD? Uefi is HP v: N21 Ver. 02.49. date: 07/13/2020
/boot/efi/EFI# efibootmgr BootCurrent: 0010 Timeout: 0 seconds BootOrder: 0010,0004,0007,000E,000B,000C,0000,0001,0002,0003,0006,0008,0009,000F Boot0000 Startup Menu Boot0001 System Information Boot0002 Bios Setup Boot0003 3rd Party Option ROM Management Boot0004* ubuntu Boot0006 System Diagnostics Boot0007* TOSHIBA External USB 3.0 20171217003012F Boot0008 Boot Menu Boot0009 HP Recovery Boot000B* KingFast : Boot000C* Intel Corporation: IBA CL Slot 00FE v0112 Boot000D* TOSHIBA External USB 3.0 20171217003012F Boot000E* USB: Boot000F Network Boot Boot0010* Fedora Boot0012* IPV6 Network - Intel(R) Ethernet Connection (H) I219-LM
I'm sorry, but HP only warranties their PCs for usage with the OS that comes preinstalled.
IF you replace that with a Linux distro, or add a Linux distro, then you assume full responsibility for maintaining that -- including solving any problems with booting the other OS and/or installing the other OS.
Your best bet for support now is to contact the support forum of the distro you are using.
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I realize HP doesn't cover the type of abuse modifications to which I subject my computers, but was hoping someone reading my post might have a solution. As it turns out, the problem appears to be solved, but I'm not sure why. Here's what I (think I) did, just in case someone, somewhere encounters the same problem:
1. Boot into Windows on the SSD via grub2 menu
2. Create Recovery USB (should have done this as soon as I received the computer, but didn't)
3. Boot Recovery USB. System apparently booted into Windows on the SSD
4. Shut down system
5. Boot into UEFI menu; go to Boot Options - lo and behold, the first entry is now for Windows on the SSD
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