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I have a Windows 10 primary installation on an HP laptop, then installed Ubuntu 18.10 same as I've done many times before; turned off all UEFI in Windows and BIOS, turned on legacy support, but this time I can ONLY boot into my Ubuntu thru the system BIOS. I'm stumped, is this some kind of new HP bios thing?

I have to hit escape to get into system BIOS on reboot, select alternate boot option (f9), then BIOS allows me to select Ubuntu boot and only then do I get my standard purple grub boot selection screen. It works, but Jesus its annoying.

Under all previous installations Ubuntu just works, recognizes Windows10, installs alongside it and sets up GRub and boots to Grub. I think I've tried everything to no avail; even ran BootRepairDisk, BCD tells me that I don't have UEFI turned off, but I know I do, I've triple checked it. What the heck?

Anybody?

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    UEFI and BIOS are not compatible. You can old dual boot from UEFI, not from grub as once you start booting in one mode you cannot switch. Just make sure to install Ubuntu in same boot mode as Windows. Post link to Summary Report from Boot-Repair. Did you update UEFI for your system and if SSD update firmware? – oldfred Mar 16 at 17:15
  • The Windows10 came pre-installed, so I assume it was UEFI. So, what you are saying is I need to turn back on all the UEFI crap and -reinstall Ubuntu and it should work. Am I following correctly? I do have an SSD HD, but I did not do any firmware updates, afraid I'd screw something up. Haven't updated anything firmware or BIOS related. I'd have to re-run Boot-Repair to get the summary. – caj411 Mar 16 at 23:02
  • Almost all systems need UEFI updates, anyway, for mitigation of Meltdown and Spectre CPU vulnerabilities from cpu speculative execution and caching. If Ubuntu installed on gpt partitioned drive, then only difference with install is grub version and whether you have a bios_grub or ESP - efi system partition. If live installer booted in UEFI mode & you add Boot-Repair, you can in Advanced options do a full uninstall of BIOS grub and then reinstall of grub converting install to UEFI boot. – oldfred Mar 17 at 2:54

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