Ok, so it seems you're booting with linuxmint's grub and not with gobo's one.
Try to simply copy this part:

title Gobolinux - Graphic Desktop
kernel (hd0,1)/System/Kernel/boot/kernel vga=0 root=/dev/hda2 Boot=Graphic

title Gobolinux - Console
kernel (hd0,1)/System/Kernel/Boot/kernel vga=o root=/dev/hda2

title Gobolinux - Framebuffer Console
kernel (hd0,1)/System/Kernel/Boot/kernel vga=791 root=/dev/hda2
in the linuxmint's grub configuration (it should be something like /boot/grub/menu.lst or grub.conf), then reboot and look if the gobolinux entries are shown correctly. If it works that way, you're done (is this phrase right in english? I always forget...), otherwise we can try to install grub again.
Be sure there are no spaces in the string "(hd0,1)/System/Kernel/Boot/kernel".

P.S.: didn't boot menu let you choose which os to boot? You just have to type c when you're seeing that screen.

Ok guys! Wish me luck!

Well, last question before the big operation: Into the grub menu of LM, I see (after the three grub choices of Mint -generic/recovery/memtest):

###END DEBIAN AUTOMAGIC KERNELS LIST

#This is a divider, added to separate the menu items below from the Debian
#ones
title Other operating systems:
root

#This entry automatically added by the Debian installer for a non-linux OS
#on /dev/hda1
title Microsoft Windows XP Professional
root (hd0,0)
savedefault
makeactive
chainloader +1

Question is: WHERE DO I PASTE THE GOBO GRUB OPTIONS? In which place? Under the "Microsoft" blah,blah or before "###END DEBIANS...". I'm confused with this "non-linux OS" to "Other operating systems" option.

It doesn't really matter where they are - the divider is just so that debian doesn't mess with your own settings when you upgrade kernels. The "Other operating systems" thing is just a title to separate things, it doesn't change anything. So anywhere after the "###END DEBIAN ..." is fine.

Edited to clarify after seeing m@cCo's post: if you put them before the ###END DEBIAN ... line, they may get wiped in a future apt-get upgrade, so put them afterwards.

Well, I copied exactly the lines that you gave me, but I can't save the document! I receive the message: "Could not save the file /boot/grub/menu.lst
You do not have the permissions necessary to save the file. Please check that you typed the locations correctly and try again".
Now, what?

You'll probably see it, but you have to be patient.
As for the first issue you must edit the file with root permissions: use sudo if it's installed or type su and then provide root password when asked to.

sudo your_editor_here /boot/grub/menu.lst
or

su #it will ask you for root password
your_editor_here /boot/grub/menu.lst

Next to the second: what username and password did you try? The ones you created with the gobolinux installer? Which account did you manage to enter with?

Last but not least: look here for a solution to the problem.

When I try to give a root command with -su or -sudo and giving my password, it returns me:
"Authentication failure. Sorry". Why is that?

In the GParted, there is a choice for a second user that is proposed as "recommended". I placed there a second name and password (it's me again). I just added a second user.

The root password is something you probably set up during the Linux Mint install (it will have been flagged as pretty important). If you didn't, it's possible Linux Mint uses sudo for everything (I don't know), in which case `sudo nano -w /boot/grub/menu.lst` will work (entering your own user account's password this time if you're prompted).

If neither of those works or you don't know the password, you can edit the file from Gobo (either installed or from the live CD) by mounting the partition and editing it there as root. If the Linux Mint partition is /dev/hdb1, you'd do the following in Gobo:
] su
[enter the root password you set during the install here.]
[If you're on the livecd, you only have to do the part after this, not the su.]
] mkdir mint
] mount /dev/hdb1 mint
] nano -w mint/boot/grub/menu.lstYou can make the changes given there and restart. Ctrl-O saves, Ctrl-X exits.

Remember that your Linux Mint users and your Gobo users are completely separate; they maintain their own user databases.

"...you can edit the file from Gobo (either installed or from the live CD) by mounting the partition and editing it there as root".

----------------------------------------

How can I do this?

Tried the terminal way:

cp: missing destination file operand after `/boot/grub/menu.lst/boot/grub/menu.lst.backup'

Try `cp --help' for more information
bash: {cat/boot/grub/menu.lst: No such file or directory

Well, I left a space between them and I received:

cp: cannot create regular file `/boot/grub/menu.lst.backup': Permission denied.
bash: {cat/boot/grub/menu.lst: No such file or directory.

Asked me for my [sudo] password and when I gave it, returned:

Intitle Gobolinux - Graphic Desktop\nkernel (hd0,1)/System/Kernel/boot/ernel vga=0 root=/dev/hda2 Boot=Graphic\ntitle Gobolinux - Console\nkernel (hd0,1)/System/Kernel/Boot/kernel vga=o root=/dev/hda2\ntitle Gobolinux - Framebuffer Console\nkernel (hd0,1)/System/Kernel/Boot/kernel vga=791 root=/dev/hda2}

Now, what?

I don't know if it really makes any difference but if you are going to paste the menu.lst entries from gobolinux to Mint it might be better to match the Mint layout of the grub menu.lst file. So I would change this:

title Gobolinux - Graphic Desktop
kernel (hd0,1) /System/Kernel/boot/kernel vga=0 root=/dev/hda2 Boot=Graphic

title Gobolinux - Console
kernel (hd0,1) /System/Kernel/Boot/kernel vga=o root=/dev/hda2

title Gobolinux - Framebuffer Console
kernel (hd0,1) /System/Kernel/Boot/kernel vga=791 root=/dev/hda2

...to this:

title GoboLinux - Graphic Desktop
root (hd0,1)
kernel /System/Kernel/Boot/kernel root=/dev/hda2 vga=0 Boot=Graphic

title Gobolinux - Console
root (hd0,1)
kernel /System/Kernel/Boot/kernel root=/dev/hda2 vga=0

title Gobolinux - Framebuffer Console
root (hd0,1)
kernel /System/Kernel/Boot/kernel root=/dev/hda2 vga=791

At least Ubuntu uses a layout like that. But also with other distributions that "root" line seemed to be more usual. Also it seems more logical to place "vga=.." behind "root=..". Again I don't know if it is really making any difference, but the above worked for me when I used the grub menu from Ubuntu to start Gobolinux.

ps. notice that your post above had vga=o instead of vga=0... careful with that.

I'm quite new to linux too.
When you need to edit a system file, the biggest problem is that you need root permissions. So you need to open the file via the terminal using su/sudo.
Nano is a text editor that works in the terminal. Gedit for example is a graphical editor used by Ubuntu and is more similar to notepad in Windows. You can open a file using, say gedit with root permissions by executing "sudo gedit ".
You can browse to the grub folder using the cd (change directory) comment:
cd /boot/grub
then to be sure you can type
ls
so you get a list of files that are in the current (grub) folder. You'll see menu.lst there too.
Now you can open menu.lst with root permissions using:
sudo nano menu.lst
When you open this file in nano you can first make a backup by saving it under a different name:
press ctrl-key+x -> then change name -> then press enter
now you can add the gobo lines in there... and when you're done with that you can save it as menu.lst:
press ctrl+x again -> change name to menu.lst again -> enter

When you're using a graphical editor such as gedit, I don't know which one Mint uses, you can just change 'nano' to the program name you want to use and to save you can just use ->file -> 'save' or 'save as' like with notepad in Windows.

A faster way to is to make a copy of the menu.lst file and save the copy under a different name. To copy a file you use 'cp'. So you get this line:
sudo cp /boot/grub/menu.lst /boot/grub/menu.lst
And to edit the menu.lst file in nano:
sudo nano /boot/grub/menu.lst

Posted By: minotaur
cp: cannot create regular file `/boot/grub/menu.lst.backup': Permission denied.
bash: {cat/boot/grub/menu.lst: No such file or directory.

Ah, sorry - of course you can't write there as a regular user. My mistake. It also looks like you missed out some spaces that need to be there, and have o instead of 0 once or twice. Copy and paste this, don't try to type it in - the spaces are important, and so is "vga=0".

cp /boot/grub/menu.lst ~/menu.lst.backup ; { cat /boot/grub/menu.lst ; echo -e "\ntitle Gobolinux - Graphic Desktop\nkernel (hd0,1)/System/Kernel/boot/kernel vga=0 root=/dev/hda2 Boot=Graphic\ntitle Gobolinux - Console\nkernel (hd0,1)/System/Kernel/Boot/kernel vga=o root=/dev/hda2\ntitle Gobolinux - Framebuffer Console\nkernel (hd0,1)/System/Kernel/Boot/kernel vga=791 root=/dev/hda2\n"; } | sudo tee /boot/grub/menu.lst

It looks like you may have edited the file last time, so first either restore the backup you made earlier (just copy it in over the top of /boot/grub/menu.lst), or take the line at the end out in nano - Ctrl-K kills the current line, then Ctrl-X to exit and save. Alternatively, have Linux Mint reconfigure grub itself if it's too far gone. It looks possible you may have overwritten the file completely from the error output. Linux Mint seems to be a Debian derivative, so run `update-grub` as root to do that.

I will repeat my recommendation of using a text editor to do the whole thing rather than this method. It's much easier to work with, and less fraught with errors like that.

Posted By: minotaurAs for the editor, I don't understand exactly the way we use it! (See, I came from Windows!) You don't mean the terminal! Where is this editor in Linux Mint and how can I use it?

As I said before, you need to run `sudo nano -w /boot/grub/menu.lst`, which I think you said you already did. That is a text editor. You use the arrow keys to move the cursor around, and you type like you usually would. Ctrl-O saves, Ctrl-K deletes a line, Ctrl-X exits. You can select text in one program (in a graphical interface), say the browser, and paste it in by middle-clicking in the terminal window with the file open. If you don't have a middle button, use the left and right simultaneously.

You can use another editor if you prefer (although I can't imagine vi's going to be easier for you...), but it really does need to be a terminal one, since we don't know how Linux Mint is set up well enough to tell you how to run a graphical one as root (it's not simple, because of Xorg's security features).