Starting on trisquel 11.0, codename aramo, it is required to provide the necessary udeb repository for the debian-installer, we mainly get it by fetching missing packages from Debian and also by rebuilding them from upstream ones.
Starting on trisquel 11.0, codename aramo, it is necessary to build all udeb packages related to debian-installer. Missing packages (like debian-installer itself) are fetched and built from Debian, and others are produced by rebuilding their source packages.
Those new packages should be added on top of the helpers mentioned at: