installation worked like a charm, but grub doesnt shows up at boot..

hello

here on two different laptops i have a problem :
there are already both on windows, but the simple attempt to install linux is a bit complicated.
the LMDE systems boot up well from liveusb. The installation works like a charm. But after a reboot, systematically the computer boot up into windows, with not showing the grub menu. Because it doesnt boot up directly on grub.efi

well, if I F9 the bios at startup, the bios itself can find within the HDD the both windows and grub efi files and boot up well on linux ; but my wish is to get the grub firstly (whom contains windows's entry) from bios. I can't change the efi variables from the bios, as it's a insydebios one.

how could i fix it?

i tried
a/ by distinguish both /boot/efi mount point and partition at the partition step of installation wizard, with no effect
b/ to install grub, in the step after, on the /dev/sda2 (instead of default /dev/sda), where sda2 is vfat efi partition (with windows), and sda8 the / root system partition,

with no effect..

i have well as the same as others computer with the same win8 and linux systems, the same /boot/efi/EFI variables, as Boot/debian/Microsoft.

im totally lost, im wondering why the computer always boot up directly on mswindows instead of grub..

i already tried those attempts, with no more success :

https://bbs.archlinux.org/viewtopic....28724#p1728724
https://askubuntu.com/a/831241
https://askubuntu.com/a/1069886
https://askubuntu.com/a/1203713

without forgetting the mount -t efivarfs efivarfs /sys/firmware/efi/efivars

what am i doing wrong?

the last time i observed a such issue, it was on a similar lenovo laptop, i did this (to separate /boot/efi by creating a completely new efi partition, then asking the installer to install grub on /dev/sda10 instead of /dev/sda) :

Quote:

================================= had that problem too : win8 installed by default, EFI mode, with GPT. Dont want to wipe all out. Had several new partitions for nux/bsd. So I booted on my beloved LMDE5 liveusb. I did about ten installs without understanding, why would that not work? each time when installation started very well, it finishes on a grub-installation failure, everytime. Even by trying changing different settings. Even using the grub-repair utility -whom, like gparted, is only on lmde5live, not lmde5 default install!- so I finally went up to boot back on my beloved LMDE5 liveusb, and took a precaution regarding it : 1. before starting again and again the installation process, I just launched gparted 2. created a new EFI fat32-somthing type of partition (could be seen in fdisk /dev/sda) in addition of the EFI-partitions made by default windows installation. 3. Means after getting at the end of the disk my several partitions (50GB /, home, +efi) 4. I attempted to install back LMDE5 with standard installer ; saying "no, dont use /dev/sda1 nor /dev/sda2 windows partitions to put your grub files/efi system, but only on /dev/sda8 new fat32 efi partition!" [I already have exactly flex20405 laptop, whom grub is well on the "windows efi standard partition", like all my others win8-10/lmde5/obsd laptops, working well since the beginning] 5. so after I did a such experience, told LMDE5 installer to use not only /, /home and swap partitions to use, but also a efi-specific partition added only for it -about 500MB-, it worked immediately. Dont know why the G50 laptop have this thing, but now, hope it would help some linuxians hearts :) Conclusion : on my own, I have triboot of win/LMDE5/obsd, like on my previous laptop. Yes, it really worth a post after those years (means hours/days of working on that problem/solution). Definitely :) ==================================

but here, it doesnt works at all... for two lenovo and HP laptops.