Can't build debian packages

[SomakChatterjee]

I can't build the debian packages for ivs despite having installed docker previously. The error looks like this:

somak@somak-HP-Pro-3330-MT:~/ivs$ build/build-debian-packages.sh
+++ readlink -f build/build-debian-packages.sh
++ dirname /home/somak/ivs/build/build-debian-packages.sh

• ROOTDIR=/home/somak/ivs/build/..
• cd /home/somak/ivs/build/..
• : Build ID: devel
• SUITE=trusty
• ARCH=amd64
• DOCKER_IMAGE=bigswitch/ivs-builder:ubuntu14.04
• BUILD_OS=trusty-amd64
  ++ mktemp -d
• BUILDDIR=/tmp/tmp.d45ksTSSK5
• mkdir -p /tmp/tmp.d45ksTSSK5/ivs
• rsync --files-from /dev/fd/63 . /tmp/tmp.d45ksTSSK5/ivs
  ++ ./build/files.sh
• git ls-files
• git submodule foreach --recursive --quiet 'git ls-files --with-tree="$sha1" |sed "s#^#$path/#"'
• docker.io run -e BUILD_ID=devel -e BUILD_OS=trusty-amd64 -v /tmp/tmp.d45ksTSSK5:/work -v /tmp/ivs.ccache:/.ccache -w /work/ivs bigswitch/ivs-builder:ubuntu14.04 ./build/build-debian-packages-inner.sh
  build/build-debian-packages.sh: line 38: docker.io: command not found

Can anyone help me out in identifying and fixing the problem?