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I am trying to install lubuntu on my Asus netbook. Before I reach installation type, I see warning:

Force UEFI Installation? This machines's firmware has started this installer in UEFI mode but it looks like there maybe existing operating systems already installed using BIOS compatibility mode, If you continue to install Debian in UEFI mode,it might be difficult to reboot into any BIOS-mode operating system.

Then if I try to go "Erase disk and install Lubuntu", it fails to install grub:

The 'grub-efi-amd64-signed' package failed to install into /target/. Without the grub boot loader, the installed system will not boot.

If I chose "Something else", create partitions: ext4 mounted in '/', swap and efi, and chose efi to install boot loader there, installation seems to finish successfully.

But when I turn the computer on again, only bios appears and I don't see lubuntu in booting options.

Failure to install grub happens also when I chose the whole disk (/dev/mmcblk0, while efi is /dev/mmcblk0p1) as a "device for boot loader installation".

On the other hand, can I correctly setup grub from terminal, considering the fact that I have a fully functioning system until I restart the computer?

Any ideas? Thank you!

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    Go into your BIOS and enable CSM and then boot the Ubuntu install media in legacy/MBR mode – Android Dev Sep 27 '17 at 19:46
  • Is grub really installed to ESP - efi system partition, but your Asus is not booting it? Can you directly boot from UEFI menu often f10 or f12? – oldfred Sep 27 '17 at 20:20
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If your UEFI-set up netbook does not want to boot, you can try to solve the problem afterwards while booting into a SystemRescueImage and there trying as root with chroot, grub-install and update-grub to install and configure your grub2. See https://wiki.debian.org/GrubEFIReinstall how to do that.

Alternatively you can try to disable SecureBoot: search for "Disabling SecureBoot in the BIOS" in your search engine (with the quotes).

There is also a Boot-Repair available, which might help: Search for "boot repair ubuntu" in your search engine (without the quotes).

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