Ubuntu – Changes in grub.cfg are ignored

grub2

I'm trying to change the default OS in grub, but when I do

sudo gedit /boot/grub/grub.cfg and change it to option 3 instead of 0 and run update-grub, nothing changes. The default selected OS is still the first one and when I look in grub.cfg it's back to 0. What am I doing wrong?

Best Answer

As stated on the top of /boot/grub/grub.cfg:

# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

Edit /etc/default/grub instead.

Here are details on how to configure the grub file; see the other answers there for a GUI-based method.

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Found the solution people. It seems that because of "burg" I must make changes to the burg file located in etc/default. And then run sudo update-burg.

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As other answers point out, you may be a victim of the recordfail situation. Editing /boot/grub/grub.cfg manually should be out of the question as is automatically generated. Another suggestion seen around is to edit the /etc/grub.d/00_header but then it could prompt for user intervention on updates.

The easiest solution is to define the undocumented GRUB_RECORDFAIL_TIMEOUT variable in /etc/default/grub. For example:

GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
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GRUB_RECORDFAIL_TIMEOUT=$GRUB_TIMEOUT

Edit

See this answer for more details.

Best Answer

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