I am following the following tutorial: Dual boot Surface Pro with Ubuntu?
When I want to create my custom bootloader I need to edit a grub script (among other ones) called 25_custom. But it's not there, I checked it with
cd / <enter> sudo find iname "25_custom"
I tried to see if the contents of 25_custom where somewhere else, so I used
grep -rnw . -e 'bkpbootx64.efi'. The string is tied to the Windows efi file. The only thing that grep returned where the results from the (downloaded) tutorial on my hard disk.
I could create the file by myself, and copy/paste what the tutorial says about it, but I don't know if that would work. I'm a bit scared to do it, because a previous mistake led me to try to repair my Surface for 10 hours.
So could someone explain what is going on? Edit: it seems 25_custom is created by boot repair, which is not needed to use in 14.10. So now I'm wondering where I'd need to place the code of 25_custom, if at all.
Note: the tutorial about the theming part is only on Github