1. dget -xu latest grub2 package from ubuntu

2. Find ucf command in debian/postinst.in and comment it. Add # LLIUREX HACK comment on top of it. You can check the current in-production postinst.in in this svn directory.

3. Once debian/postinst.in is modified copy it to this directory and commit changes

4. dch -i  to update changelog +lliurex1

5. dpkg-buildpackage -S -sa -k$YOUGPGKEY and dput changes to ppa. No need to store source code in svn.

6. grub-signed source needs to be uploaded as well after grub2+lliurex1 is available in llxdev ppa. dget -xu latest grub-signed source, dch -i to update changelog +lliurex1 . dpkg-buildpackage -S -sa -k and dput changes to ppa

https://packages.ubuntu.com/search?keywords=grub2
https://packages.ubuntu.com/search?keywords=grub-efi-amd64-signed