diff -Nuar fuentes.orig/d-i/source/localechooser/localechooser fuentes/d-i/source/localechooser/localechooser
--- fuentes.orig/d-i/source/localechooser/localechooser	2016-07-04 11:17:55.310014000 +0200
+++ fuentes/d-i/source/localechooser/localechooser	2016-07-04 11:21:17.206014000 +0200
@@ -428,6 +428,10 @@
 		fi
 	done
 	choices="$(echo "$choices" | sed 's/#%#/\\,/g')"
+	if [ "$lang" = "ca" ]; then
+	    choices_c="ca_ES.UTF-8@valencia, ${choices_c}"
+	    choices="Valencia\${!TAB}-\${!TAB}ca_ES.UTF-8@valencia, ${choices}"
+	fi
 	db_subst $tpl_preferredlocale CHOICES-C "$choices_c"
 	db_subst $tpl_preferredlocale CHOICES "$choices"
 }
@@ -838,6 +842,12 @@
 
 		askedpreflocale=
 		if [ -z "$locale_preseeded" ] && [ "$use_lang" ]; then
+			if [ "$LANGUAGE" = "ca_ES@valencia" ]; then
+			    LOCALE="ca_ES.UTF-8@valencia"
+			    db_set $tpl_di_locale $LOCALE
+			    db_set $tpl_preferredlocale $LOCALE
+			fi
+			log "Llamando a buildpreferred con $LANGUAGE $LOCALE"
 			build_preferredlocale_choices $LANGUAGE $LOCALE
 
 			if has_choice $tpl_shortlist $COUNTRYCODE; then