I have Dual Boot: Windows 10 + Ubuntu 19.10. I've got tired of Windows operating system. Today, I tried to remove timeout for the Grub2. However, simply setting Timeout to 0, in the file: /etc/default/grub did not work. This Workaround does work.

setGrubTimeoutToZero.md

Problem: Setting Grub2 Timeout to 0 leads to the same Timeout 10, on Dual Boot.

These are the instructions to make Grub2 load Ubuntu directly.

1. Open Grub2 Default Settings file: sudo gedit /etc/default/grub

2. Changing the Grub2 Settings file

   1. Make sure GRUB_TIMEOUT is set to 0
   2. Make sure to add GRUB_DISABLE_OS_PROBER=true line somewhere.
   3. Make sure to add GRUB_RECORDFAIL_TIMEOUT=$GRUB_TIMEOUT line somewhere near as well.

   • Summary: These are the additions and changes to the file: /etc/default/grub

     GRUB_TIMEOUT=0
     GRUB_DISABLE_OS_PROBER=true
     GRUB_RECORDFAIL_TIMEOUT=$GRUB_TIMEOUT
     

3. Generate a new Grub2 Boot file: sudo update-grub

More information: https://askubuntu.com/a/698230
https://help.ubuntu.com/community/Grub2/Setup