Is it advisable to disbable the Windows Secureboot option after dual booting with Ubuntu?

Question

I successfully dual boot ubuntu 16.04(LTS) with Windows 10 OS on my Dell XPS 9350 using videos on YouTube. During the process, it was required to

1. disable the Windows Secure-boot option
2. boot in SAFEMODE."SystemConfiguration--> safe boot--> Minimal"
3. Change SATA operations from RAID to AHCI.

Now if I am using Windows, In the safe mode, I can't work as I was before. The problems are

1. Applications such as IntelliJ(an IDE) doesn't start from the start menu.
2. The hibernate option has gone.
3. Application cannot detect the audio drivers.

Could any suggest that Is it safe to resume the Normal boot mode.? FYI, a few screenshots.

Also, I tried changing to Normal boot mode by changing MSConfig as Normal settings.

Since then Windows works perfectly fine, but now I didn't get an option booting laptop for Windows Manager & Ubuntu. Instead, Windows directly gets started.

One solution I tried, In this situation, Whenever, I start my system, I need to press F12 and select UBUNTU, then it redirects me to GRUB loader and then I can select whichever OS I wanna use(and I don't have to start windows in safe mode anymore.).

Could anyone help what's happening and how to get

1. normal windows execution.
2. Both Windows & Ubuntu as an option upon booting the laptop without pressing F12.

Answer 1

This may not be the answer (but I am not able to just 'comment').

Have you switched Windows into 'Fastboot' mode ? That is a misleading name because it really means just hibernate so when you restart the machine you will not get a bootloader menu but simply restart Windows.

I inadvertently did this after installing linux onto a Windows 7 (or 8) machine and ot gave me the same symptoms that you have; it proved non-trivial to revert to the bootloader, or at least it tool a while to understand the problem, and I think that after I corrected Windows I just reinstalled linux.

graham