fix to update dpkg before starting script

.travis.yml

@@ -51,6 +51,7 @@ before_script:
   - set -x
   - if [ "${TRAVIS_SECURE_ENV_VARS}" == "true" ]; then openssl aes-256-cbc -K $encrypted_b79fc5843df3_key -iv $encrypted_b79fc5843df3_iv -in .secrets.tar.enc -out .secrets.tar -d; tar -C ~/ -xvf .secrets.tar; export INSTALL_SRC="$INSTALL_SRC $INSTALL_SRC_SECURE"; export TEST_PKGS="$TEST_PKGS $TEST_PKGS_SECURE"; fi
   - export REPOSITORY_NAME=`basename $PWD`
+  - if [ "${ROS_DISTRO}" == "indigo" -o "${ROS_DISTRO}" == "jade" ] ; then sudo apt-get install -y --force-yes dpkg; fi
   - if [ "${INSTALL_SRC}" != "" ] ;then export sudo apt-get install python-yaml; export BEFORE_SCRIPT="$(for src in $INSTALL_SRC; do name=`basename $src`; echo "python -c \"import yaml;print yaml.dump([{\\\"git\\\":{\\\"uri\\\":\\\"$src\\\",\\\"local-name\\\":\\\"$name\\\"}}], default_flow_style=False)\" >> .rosinstall;"; done)ls -al; cat .rosinstall; wstool update"; export USE_DEB=false; fi; # set USE_DEB false to enable .travis.rosinstall
 script:
   - if [ "${IS_EUSLISP_TRAVIS_TEST}" != "true" ] ; then export ROS_PARALLEL_JOBS="-j2 -l2" ; fi