Ubuntu 18.04.1 does'nt recognize windows at all

[mysterio_1]

My laptop initially had windows 18.04 dual booted in it. It had grub menu for selecting OS. I had initially problems in installing WiFi adapter but finally i was able to install it, but temporarily. Probably, while making the settings permenant i would have made some mistake. I was unable to reinstall the driver. I tried a lot but i was not able to reintall it. Finally, i decided to reinstall ubuntu.I deleted the entire drive partition in which ubuntu was installed in. To properly delete grub, i typed some commands in command prompt of Windows 10 automatic pc repair and troubleshooter. I executed-

bootrec /fixmbr - Successfull

bootrec /fixboot - access is denied

I resatrted my pc. Windows 10 was successfully starting without showing any errors. I rebooted it 3-4 times to ensure ubuntu is fully deleted, everything was fine. So i downloaded latest ubuntu 18.04.1 and tried to dual boot. Everything goes well. But, before installing ubuntu it does'nt shows option for "Install Ubuntu alongside windows" it shows all other 4 options like "erase drive and install ubuntu"; "something else", etc. It shows no option like "Install Ubuntu alongside windows". I have dual booted 2-3 times before but it never happened like this. I dont want to risk my windows 10. I uncheked the hibernate option and fast start  option in control panel of windows 10 but it does'nt work.link for my previous post for wifi adapter-  https://h30434.www3.hp.com/t5/Notebook-Wireless-and-Networking/No-WiFi-adapter-in-ubuntu-18-04-LTS/t...

Please HP help me. Please......

[IT_WinSec · Accepted solution]

Hello @mysterio_1

WHY THIS HAPPENS?

Operating systems (Windows or Linux) cannot read all the files you may have , they read the booloader. Ubuntu doesn't detect the bootloader information for Windows because it is locked, hidden or missing

REASONS:

It's either something very simple or very serious.

Simple stuff is BIOS settings, Windows 10 settings (UEFI mode, Secure boot, Legacy mode in BIOS  ;  Windows 10 Fast start up)

Serious stuff is you deleted something in the Windows 10 bootloader and Ubuntu doesn't detect it.

POSSIBLE SOLUTIONS:

0) Disable Secure Boot and enable Legacy mode in the BIOS. Test if Windows 10 can boot fine. Otherwise, return the settings or reconfigure the boot settings in BIOS.

Disable Fast startup in Windows

Check these as well,

1) https://sites.google.com/site/easylinuxtipsproject/reserve-10

2) https://askubuntu.com/questions/880579/installer-does-not-detect-windows-10

3) https://askubuntu.com/questions/163962/install-alongside-option-missing-how-do-i-install-ubuntu-besi...

Hope this helps.

Let me know how it goes. Looking forward to your reply.

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**** Please mark this post as an accepted solution if it helps ****

[mysterio_1]

Thanks a lot sir for replying. Actually ubuntu was not able to detect when i was trying to install it in UEFI option. In my booting options there were 2 options showing name of my USB pendrive. One of it was with UEFI and other was without it. When i tried to install it with 2nd option, Ubuntu successfully detected WIndows. My pc is successfully dual booted with both operating systems. Everything is fine till now. But why ubuntu was not able to detect windows in UEFI option?? Have i done some serious mistake in BIOS which i am unaware of? or there is something else? I dont know.