I know this question has been asked several times, but none of the answers seem to be working in my case.
I have win 10 and Ubuntu. but there is no dual boot menu. GRUB does not show in the bootup. it automatically boots into windows, if I go to the BIOS in the startup and from the boot menu choose my HDD, it boots into Ubuntu!
Question is how to fix GRUB and have it show the OS select menu in the startup?
In the GRUB customizer, it does not show Windows either.
What I did: on a blank hard disk, I installed win 10, disabled fastboot, installed UBUNTU 16 from a USB flash memory. While installing Ubuntu, there was no option for "Install Ubuntu alongside windows boot manager", so I choose something else and installed ubuntu successfully.
This is my hard disk:
user@ubuntpc:~$ sudo lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL NAME FSTYPE SIZE MOUNTPOINT LABEL sda 2,7T ├─sda1 128M ├─sda2 ntfs 1T HD1 ├─sda3 ntfs 1T HD2 ├─sda4 ntfs 713,2G HD3 └─sda5 swap 33,2G [SWAP] sdb 232,9G ├─sdb1 ntfs 450M Recovery ├─sdb2 vfat 99M ├─sdb3 16M ├─sdb4 ntfs 99,5G ├─sdb5 ext4 75G / └─sdb6 ntfs 57,9G
(I have 3TB HDD, I use it only for the UBUNTU SWAP and DATA files. I have 250 GB SSD I use it for both windows and ubuntu os).