Startup in GRUB with dual boot Windows 10

Question

I have installed a dual boot of Ubuntu 18.10 and Windows 10.

Now when I start up my PC it goes directly to Windows 10. I have to click esc to abort the automatic startup and go to the GRUB options.

I want my PC to start up in GRUB so I can choose which OS to boot.

I have tested this process:

I have tried running this command in Ubuntu:

sudo update-grub2

and rebooted, but it didn't work. The terminal says that if it didn't work I should post this URL:

http://paste.ubuntu.com/p/VKW6QVyZWD/

What should I do

First 15 lines of /etc/default/grub

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
#GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=10
#GRUB_HIDDEN_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

When I run the command, grep -A3 -B1 timeout /boot/grub/grub.cfg I get:

/boot/grub/grub.cfg-if [ "${recordfail}" = 1 ] ; then
/boot/grub/grub.cfg:  set timeout=30
/boot/grub/grub.cfg-else
/boot/grub/grub.cfg:  if [ x$feature_timeout_style = xy ] ; then
/boot/grub/grub.cfg:    set timeout_style=menu
/boot/grub/grub.cfg:    set timeout=10
/boot/grub/grub.cfg:  # Fallback normal timeout code in case the timeout_style feature is
/boot/grub/grub.cfg-  # unavailable.
/boot/grub/grub.cfg-  else
/boot/grub/grub.cfg:    set timeout=10
/boot/grub/grub.cfg-  fi
/boot/grub/grub.cfg-fi
/boot/grub/grub.cfg-### END /etc/grub.d/00_header ###
--
/boot/grub/grub.cfg-}
/boot/grub/grub.cfg:set timeout_style=menu
/boot/grub/grub.cfg:if [ "${timeout}" = 0 ]; then
/boot/grub/grub.cfg:  set timeout=10
/boot/grub/grub.cfg-fi
/boot/grub/grub.cfg-### END /etc/grub.d/30_os-prober ###
/boot/grub/grub.cfg-
grep: –: No existe el archivo o el directorio
grep: Paul: No existe el archivo o el directorio
grep: Benson: No existe el archivo o el directorio
grep: 2: No existe el archivo o el directorio
grep: hours: No existe el archivo o el directorio
grep: ago: No existe el archivo o el directorio

Thanks!

Answer 1

If you want GRUB menu to be shown at startup, then comment out

GRUB_TIMEOUT_STYLE=hidden

to be

#GRUB_TIMEOUT_STYLE=hidden

to /etc/default/grub, then run

sudo update-grub

Answer 2

There's one more solution for this:

Boot into Windows and download easybcd application and then run it as an administrator.

Make an Ubuntu entry in easybcd and then add that entry with Windows in edit boot menu.

Uncheck skip boot menu option.

Then test it whether it works, and if not then repair boot files through it making sure that Ubuntu entry is still alongside the Windows entry.

For detailed steps see the section of this YouTube video from 9:16 minutes to 10:00.