Yes, I did do sudo update-grub.
Changing the /etc/default/grub GRUB_TIMEOUT variable seems to work once, but then after that first time every time I reboot the timeout is 30 seconds and my time I set is ignored.
I am running Lubuntu and Windows 7. GRUB2 came with Lubuntu 14.04.
This could be an issue connected to GRUB_RECORDFAIL_TIMEOUT. According to the official Ubuntu documentation — which is still relevant to Lubuntu — it says:
If the last boot failed or after a boot into Recovery Mode the menu will be displayed until the user makes a selection.
To change this behaviour, edit /etc/default/grub and add the variable GRUB_RECORDFAIL_TIMEOUT. Set the value similar to setting for GRUB_TIMEOUT.
- For -1, there will be no countdown and thus the menu will display.
- For 0, menu will not display even for a failed startup.
- For >=1, menu will display for the specified number of seconds.
Run update-grub after the change have been made.
It could be that your setup is somehow just powering down and/or rebooting Lubuntu in a way that makes it feel that the last boot failed — or the system crashed — thus it’s going to look for the GRUB_RECORDFAIL_TIMEOUT value and use it’s default value if it’s not set elsewhere.
Regardless, here is how I tweak that GRUB_RECORDFAIL_TIMEOUT value.
First, open up /etc/default/grub using nano—or you can use whatever text editor you like—like this:
sudo nano /etc/default/grub
Then I set GRUB_TIMEOUT and then GRUB_RECORDFAIL_TIMEOUT like this:
GRUB_TIMEOUT=0
GRUB_RECORDFAIL_TIMEOUT=$GRUB_TIMEOUT
Note that I am setting GRUB_RECORDFAIL_TIMEOUT with a variable reference to $GRUB_TIMEOUT instead of setting a new number; feel free to change that to a real number if you need different timeout values.
Then I update GRUB and all should be good:
sudo update-grub2
