Update ubuntu

- `ubuntu:precise`: 20150427
- `ubuntu:trusty`: 20150427
- `ubuntu:utopic`: 20150427
- `ubuntu:vivid`: 20150427

library/ubuntu

@@ -4,31 +4,31 @@
 # see also https://wiki.ubuntu.com/Releases#Current
 
 # commits: (master..dist)
-#  - 7fef77c Update tarballs
-#    - `ubuntu:precise`: 20150320
-#    - `ubuntu:trusty`: 20150320
-#    - `ubuntu:utopic`: 20150418
-#    - `ubuntu:vivid`: 20150421
+#  - 43f0305 Update tarballs
+#    - `ubuntu:precise`: 20150427
+#    - `ubuntu:trusty`: 20150427
+#    - `ubuntu:utopic`: 20150427
+#    - `ubuntu:vivid`: 20150427
 
-# 20150320
-12.04.5: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 precise
-12.04: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 precise
-precise-20150320: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 precise
-precise: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 precise
+# 20150427
+12.04.5: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 precise
+12.04: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 precise
+precise-20150427: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 precise
+precise: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 precise
 
-# 20150320
-14.04.2: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 trusty
-14.04: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 trusty
-trusty-20150320: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 trusty
-trusty: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 trusty
-latest: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 trusty
+# 20150427
+14.04.2: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 trusty
+14.04: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 trusty
+trusty-20150427: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 trusty
+trusty: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 trusty
+latest: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 trusty
 
-# 20150418
-14.10: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 utopic
-utopic-20150418: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 utopic
-utopic: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 utopic
+# 20150427
+14.10: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 utopic
+utopic-20150427: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 utopic
+utopic: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 utopic
 
-# 20150421
-15.04: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 vivid
-vivid-20150421: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 vivid
-vivid: git://github.com/tianon/docker-brew-ubuntu-core@7fef77c821d7f806373c04675358ac6179eaeaf3 vivid
+# 20150427
+15.04: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 vivid
+vivid-20150427: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 vivid
+vivid: git://github.com/tianon/docker-brew-ubuntu-core@43f0305b40bfe5f02cc007027be875256ab2b563 vivid