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I'm not understanding about the disk partitioning with Windows 10 for a dual boot. I'm just able to boot with legacy devices (Ubuntu), but when I try to boot in efi mode, then the default boot device is missing. I've created a bootable USB stick:

sudo dd if=~/Downloads/ubuntu-18.04.2-desktop-amd64.iso  of=/dev/sdb bs=1M status=progress 

I was following an installation tutorial, and now I have the following disk partitions:

Device             Start       End   Sectors   Size Type
/dev/nvme0n1p1      2048    534527    532480   260M EFI System
/dev/nvme0n1p2    534528    567295     32768    16M Microsoft reserved
/dev/nvme0n1p3    567296 210282495 209715200   100G Microsoft basic data
/dev/nvme0n1p4 498069504 500117503   2048000  1000M Windows recovery environment
/dev/nvme0n1p5 210282496 210286591      4096     2M BIOS boot
/dev/nvme0n1p6 210286592 218675199   8388608     4G Linux swap
/dev/nvme0n1p7 218675200 498069503 279394304 133,2G Linux filesystem

Does someone have a suggestion how grub can handle this partition or how I should reinstall Ubuntu?

I booted linux in efi mode without security boot, reinstalled linux beside windows

Device             Start       End   Sectors   Size Type
/dev/nvme0n1p1      2048    534527    532480   260M EFI System
/dev/nvme0n1p2    534528    567295     32768    16M Microsoft reserved
/dev/nvme0n1p3    567296 197165314 196598019  93.8G Microsoft basic data
/dev/nvme0n1p4 498069504 500117503   2048000  1000M Windows recovery environment
/dev/nvme0n1p5 197167104 498069503 300902400 143.5G Linux filesystem

Now I getting a message in blue blue box from bios:

DEFAULT BOOT DEVICE MISSING OR BOOT FAILED. INSERT RECOVERY MEDIA AND HIT ANY KEY.

Something is missing.

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