Set Default OS by Manually configuring Grub:
- Edit the configuration file via command:
# sudo gedit /etc/default/grub
Now, change the line GRUB_DEFAULT=0 to GRUB_DEFAULT=saved
and now save the file.
In Ubuntu, use the command below to edit the Grub configuration file:
# sudo nano /etc/default/grub
And save changes in this file.
- To apply the configuration changes you need to run the Update grub command :
# sudo update-grub
- Finally set a default boot OS simply using the below command:
# sudo grub-set-default NUMBER
Boot entries start from 0. If the Windows Boot Manager is the second entry, so the NUMBER is
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