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I recently switched from Ubuntu 11.04 to Mandriva 2010.2 and I have encountered a somewhat-serious issue. When I recently rebooted my computer to boot into Ubuntu (to export Chrome bookmarks, etc), I found that the GRUB was entirely overwritten by the Mandriva install, making me unable to boot into Ubuntu. How do I add my Ubuntu partition to GRUB, so I am to boot into it also?
First boot from Mandriva Linux, then mount Ubuntu's /boot partition.
Open Ubuntu's /boot/grub/menu.lst (if it is older version of GRUB).
Copy Ubuntu's boot configuration, paste it into Mandriva's /boot/grub/menu.lst file.
Then restart the machine.
I am booting Ubuntu 10.10 with Grub2 from PCLinuxOS (Mandriva based) with the following entry, Ubuntu on sda5:
It works with or without the savedefault and boot lines on my system. Others have said they need to remove those lines to boot. You would need to ascertain whether the core.img file is in the Ubuntu /boot/grub directory.
When I try to log in as root it says "Root logins are not allowed". What settings do I need to change
Are you trying to log in to the Graphical User Interface? You should just open a terminal and log in as root. I don't have Mandriva installed but you should have a menu icon in the Taskbar or somewhere. Just look for terminal or konsole and click it to open it. The type: su - (hit the enter key) type your root password when prompted, hit the enter key again. You will then need to open a text editor, I don't know which Mandriva uses. You could try: kwrite /boot/grub/menu.lst to see if it opens. Personally, to edit files as root I always use vi text editor. (Just tried kwrite on my system, it opened as a normal user but not as root??)
EDIT: I used su instead of su -, so if you want to try kwrite, enter su - in a terminal, enter root passwd, type: kwrite /boot/grub/menu.lst. That should work also.
Try: vi /boot/grub/menu.lst
If this opens your menu.lst file, hit the "i" key (lower case Letter I for insert) then use the arrow keys on your keyboard to navigate to where you want to put the entry for Ubuntu. You will most likely need to change the root entry as you did not indicate which partition your Ubuntu was on. When you have inserted your entry, hit the ESC key on your keyboard and to save and exit type: :wq and hit enter. That is a colo and lower case letters wq. There are other ways, this is just the one I'm familiar with.
Last edited by yancek; 06-26-2011 at 08:29 PM.
Reason: Add info