Change to Disco.

update.cfg

@@ -1,7 +1,7 @@
 [DEFAULT]
-dist: cosmic
+dist: disco
 
-[cosmic]
+[disco]
 seeds: desktop
 architectures: i386 amd64 armhf arm64 ppc64el s390x
 seed_base: http://people.ubuntu.com/~ubuntu-archive/seeds/
@@ -13,6 +13,6 @@ archive_base/ppc64el: %(archive_base/ports)s
 archive_base/s390x: %(archive_base/ports)s
 components: main restricted universe
 
-[cosmic/vcs]
+[disco/vcs]
 seed_base: git+ssh://git.launchpad.net/~lubuntu-dev/ubuntu-seeds/+git/ git+ssh://git.launchpad.net/~ubuntu-core-dev/ubuntu-seeds/+git/
 seed_dist: lubuntu.%(dist)s