Skip GRUB

If you need to use the Windows Boot Manager instead of GRUB, you'll probably want to automatically skip GRUB after it's chain-loaded via the Windows Boot Manager...

$ sudo nano /etc/default/grub

GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX=""
GRUB_DISABLE_OS_PROBER=true

$ sudo update-grub
$ sudo reboot

Info'...
1. https://askubuntu.com/questions/18775/how-to-remove-or-hide-the-grub-boot-menu
2. https://help.ubuntu.com/community/Grub2/Setup#Configuring_GRUB_2

Notice that there is no zero for GRUB_HIDDEN_TIMEOUT. This is important.