stupidly the "Metapackage: false" option is case sensitive...

tasks/doudou-base

@@ -1,5 +1,5 @@
 Task: doudou-base
-Metapackage: False
+Metapackage: false
 Description: DoudouLinux base
  DoudouLinux is a Debian system cusomized to be easy to use for
  children. It provides tens of applications that suit children from 2 to

tasks/doudou-dev-artists

@@ -1,5 +1,5 @@
 Task: doudou-dev-artists
-Metapackage: False
+Metapackage: false
 Description: DoudouLinux Art development
  DoudouLinux is a Debian system cusomized to be easy to use for
  children. It provides tens of applications that suit children from 2 to

tasks/doudou-games

@@ -1,5 +1,5 @@
 Task: doudou-games
-Metapackage: False
+Metapackage: false
 Description: DoudouLinux Games
  DoudouLinux is a Debian system cusomized to be easy to use for
  children. It provides tens of applications that suit children from 2 to