HADOOP-11801. Update BUILDING.txt for Ubuntu. (Contributed by Gabor Liptak)

BUILDING.txt

@@ -28,14 +28,8 @@ Installing required packages for clean install of Ubuntu 14.04 LTS Desktop:
   $ sudo apt-get -y install maven
 * Native libraries
   $ sudo apt-get -y install build-essential autoconf automake libtool cmake zlib1g-dev pkg-config libssl-dev
-* ProtocolBuffer 2.5.0
-  $ wget https://github.com/google/protobuf/releases/download/v2.5.0/protobuf-2.5.0.tar.gz
-  $ tar -zxvf protobuf-2.5.0.tar.gz
-  $ cd protobuf-2.5.0.tar.gz
-  $ ./configure
-  $ make
-  $ sudo make install
-  $ sudo ldconfig
+* ProtocolBuffer 2.5.0 (required)
+  $ sudo apt-get -y install libprotobuf-dev protobuf-compiler
 
 Optional packages:
 

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -311,6 +311,9 @@ Release 2.7.0 - UNRELEASED
     HADOOP-10670. Allow AuthenticationFilters to load secret from signature
     secret files. (Kai Zheng via wheat9)
 
+    HADOOP-11801. Update BUILDING.txt for Ubuntu. (Gabor Liptak via
+    Arpit Agarwal)
+
   OPTIMIZATIONS
 
     HADOOP-11323. WritableComparator#compare keeps reference to byte array.