Dual-boot boot(GRUB) menu is not showing

[anuja123]

I have an HP Pavilion - 15-cs3006tx laptop with dual-boot configured.  Recently I got a BIOS update from HP and Windows 10 update as well.  After that, I am not able to see the grub menu and the system is directly booting into Windows. I am not able to boot into Ubuntu. I am not sure exactly which update has caused this issue.
I  also tried disabling the fast startup in Windows but it didn't resolve the issue.
Any suggestions to resolve this issue would be helpful.
Thanks!

[Dragon-Fur]

@anuja123 

Windows has overwritten the boot loader.

Reinstall Grub.

For example,

https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows

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[anuja123]

Is there any other way if I don't have Ubuntu CD available?