[ubuntu] Grub2 introduction

[ranch hand]

We hit grub2, knowing it was coming, when karmic(testing)Alpha2 was put out. It does come as a shock when you have gotten used to grub-legacy.

The first three link are great. The 2 guys responsible for the first 3 can make grub2 sit up and beg.

drs305 is very active on the forums here. Real good stuff.

Glad I was of some help. Some times it is nice if the thing is kept simple until you learn a little bit.

[emeraldgirl08]

Thanks ranch hand!

I was also a little puzzled about the new Grub menu I saw at start up. This thread is a life-saver!

[ranch hand]

An awful lot of folks here on the forums put up with some pretty simple questions when I join. Some time you have to give a little back.

You really need to check the links though. Those are really great. And in a lot more detail.

Glad I could help.

[emeraldgirl08]

Looks like I got a different kernel in this morning. During installation of the updates I got a prompt asking if I wanted to keep grub settings, go with the suggested, etc. I went with the first option on the pull-down menu. Sorry I forget what it said exactly.

Okay in Jaunty I once chose a different option and Jaunty would boot the older kernel and not the newer version. To fix that I had to manually add the newer kernel name into /grub/boot/menu.lst and save. This worked with the older GRUB.

However- since Grub2 is new I am not sure what the kernel my laptop should be loading.

Any idea??? TIA.

[ranch hand]

If you are real worried about it just run;

sudo update-grub

If you are just using the generated menu that will always keep it up to date.

If you do not want to look at all the menu entries for all of your kernels but want to keep them incase of some problem, you could try creating a custom menu.

All that entails is creating an entry in /etc/grub.d/40_custom that looks like this;

echo "Adding Lounge on sda7" >&2 
cat << EOF
menuentry "Lounge on sda7" {
    set root=(hd0,7)
        linux /vmlinuz root=/dev/sda7 so quiet splash
        initrd /initrd.img
}
EOF

That is a symbolic entry that just points grub at a partition. It will boot the most resent kernel present so it never needs updated.

The one above would need edited for your box with the correct partition indicated. The only part that really does anything is between the { and the }. You can edit the rest to suit your self if you leave the form alone. The title is between " and " what you put there is up to you.

Make sure the { and } are placed where shown. Do not forget the EOF at the end.

Rename the file when you save it to 06_custom and your entry will appear at the top of the menu on your screen.

Of coarse you must run;

sudo update-grub

To get this change written to your /boot/grub/grub.cfg file.

[Z2.]

Thanks for your post RH - I was having a bit of a time with Grub2, now I know why (more or less)

[halovivek]

HI
IF i upgrade to GRUB 2 from the GRUB 1.
After upgrading my system from 9.04 to 9.10.
will the GRUB 2 Error 15 will arise?
Please let me know.
So i can go ahead and install the same.
Thanks

[ranch hand]

Originally Posted by halovivek HI IF i upgrade to GRUB 2 from the GRUB 1. After upgrading my system from 9.04 to 9.10. will the GRUB 2 Error 15 will arise? Please let me know. So i can go ahead and install the same. Thanks

If you have not yet upgraded 9.04 there are a couple things I would do first;
A>revert to the generic video driver.
B>rename or delete /etc/X11/xorg.conf (9.10 will generate the xorg.conf file if needed)
C>remove "grub" and "grub-common"
D>install "grub-pc" and "grub-common"

If you have already upgraded then yes I believe that will help and you should have this link too;
https://wiki.ubuntu.com/Grub2#Recove...20via%20LiveCD

[Gregmond]

Originally Posted by darthmob Damn that's a lot to read into. Seems like things have taken a few steps into the direction of way more complicated. Luckily changing the timeout of the grub menu is still a matter of changing one line in a config. Change it in /etc/default/grub and execute a grub-update via terminal.

Damn I was going insane looking at this. I had a problem with my mouse, found an article that said add "noapic acpi=off" to the menu.lst (which I knew how to do for grub v1), and then started pulling my hair out tryiong to apply it to a clean install of Karmic Koala. Original post is very informative, but a little over the top for what I needed. Darthmob - thanks, your comment gave me an easy fix. Modifed the default file and did a sudo grub-update and it worked.. Mouse is now fixed by the looks of it.