I recently followed this guide to dual-booting OEM Windows 8 and Ubuntu, and now I've got an awful GRUB menu full of redundant entries. All I want are two entries: one for Ubuntu, and one for Windows. I'd also like to be able to rename them, since the entry for Windows 8 has a name that doesn't make any sense.
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First try grub-customizer, see this answer, but you should know that grub-customizer has some issues with the newest grub-2.00.
If you like the manual editing way, open a terminal (Ctrl+Alt+T) and run
gksudo /etc/grub.d/40_custom && gedit /boot/grub/grub.cfg
Here you will create YOUR custom grub entries. If you have another Linux system (Windows no matters), then you must update these custom entries by hand every time a new kernel arrives in the other Linux system (not Ubuntu).
Now you must have two documents opened, the one (40_custom) is opened with root privileges.
Each entry begins with
menuentry
and ends with this symbol }
Copy paste the entries you want from grub.cfg to 40_custom . Not Ubuntu's entries. Only the entries from ### BEGIN /etc/grub.d/30_os-prober ### and below.
When done, save the 40_custom document.
Run in terminal
sudo chmod 644 /etc/grub.d/30_os-prober
sudo chmod 755 /etc/grub.d/40_custom
sudo update-grub
Above commands will remove the execute permissions from 30_os-prober (that scans for other Operating Systems and add the entries) and will give execute permissions to your custom script (40_custom). Last command will update grub with the new values.
Check the new values with
cat /boot/grub/grub.cfg
Above method is a bit tricky and dangerous. You should edit the files very carefully because you may wind up with a corrupted grub menu or no menu at all. If that's the case, you have to use boot-repair from a Live media to restore grub.
More grub tips and tricks can be found in Ubuntu Wiki/Grub2, for custom menus look here.
Good Luck
