Changing Default OS to boot first

[Rex Bouwense]

I just finished reading the information found here:
https://help.ubuntu.com/community/Grub2#File_Structure
twice and still don't understand what I am supposed to do so I can change the default boot in my dual boot system from Lubuntu to Ubuntu. Any help will be appreciated.

[ubudog]

For Grub, I recommend installing Grub Customizer.

sudo add-apt-repository ppa:danielrichter2007/grub-customizer

sudo apt-get update

sudo apt-get install grub-customizer

Hope that helps,
ubudog

[Rex Bouwense]

Thanks ubudog. I installed and save and will now reboot to see if it works.

I rebooted and the default boot order was not saved even though I saved it. Must I do something else? The same thing happened when I used Startup Manager.

[ubudog]

Hmm, did you edit it like this?:
Grub Customizer > Preferences > "General" tab > default entry > Predefined:

And then click the "Save" button?

[Rex Bouwense]

Not until you told me to do that, but it didn't make any difference. The default boot is still Lubuntu even after I performed the edit that you told me and rebooted.

[ubudog]

Try this:
https://help.ubuntu.com/community/Gr...rub_.28file.29

So, an example command would be:

sudo grub-set-default 3

Assuming your Ubuntu install is third in the list.

Then, make sure to do:

sudo update-grub2

And reboot! Hope that works.

[Rex Bouwense]

That didn't work either. This is getting a wee bit frustrating, but if everything ran perfectly we wouldn't have anything to do.

[ubudog]

Yeah, this is strange. Can you please post the output of:

sudo update-grub2

[Quackers]

Are you using 11-04? Last I heard Grub Customizer wasn't working with 11-04's grub version. Startup Manager neither.
You could do it the old way by editing /etc/default/grub and changing
GRUB_DEFAULT=0
to
GRUB_DEFAULT= ## the number of the item you want to be default in the present grub menu - but don't forget to subtract 1 from the menu item number as the first entry is entry 0 not 1
Then save the new file and run sudo update-grub.

http://ubuntuforums.org/showthread.php?t=1195275

[oscarivera9]

I've got the same exact problem here.
Neither Grub Customizer nor Start-Up Manager work with the Grub2 version that comes with Natty. I used to use Start-Up Manager just fine in the past and it always worked. I first discovered Start-Up Manager when I was using Ubuntu 10.04 and it worked then just as it worked with 10.10 but there were lots of changes to Grub2 by the time that 11.04 came out. I also had difficulties changing my Grub2 Splash Image because none of the examples online about how to change the splash images are relevant now that Grub2 has changed. Somehow I was able to figure that one out and since then I have not taken the time to figure out how to change the Default Startup OS but maybe I'll give it a shot right now since I've got a bit of time on my hands.
As soon as I figure out how to do it I'll post it here, unless someone else beats me to it. So please Rex, if something you try works for you, let us know because I'm sure there are more people besides you and me who would like to know how to do that.