Gazebo 5.4 premature release?

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Today I got the following problem when launching Gazebo (Ubuntu 14.04):

[Err] [RTShaderSystem.cc:414] Unable to find shader lib. Shader generating will fail.[Err] [Server.cc:285] Could not open file[worlds/empty.world]
terminate called recursively
terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::lock_error> >'
Aborted (core dumped)
[gazebo-2] process has died [pid 3322, exit code 134, cmd /opt/ros/indigo/lib/gazebo_ros/gzserver --verbose -e ode worlds/empty.world __name:=gazebo __log:=/home/jvgomez/.ros/log/7bf27612-df0f-11e6-a9b3-7824afa13789/gazebo-2.log].

After investigating a bit I saw that I have the following folders:

/usr/share/gazebo
/usr/share/gazebo-5.3
/usr/share/gazebo-5.4

The first two only have a setup.sh but the third one has media and worlds folder. After copying these to /usr/share/gazebo-5.3 everything was working again.

Investigating further, I saw that in /usr/bin there are ony 2 binaries : gazebo and gazebo-5.3.0. In fact, synaptic shows that gazebo5-common package has been updated to 5.4.0-1~trusty while the others are still 5.3.0-1~trusty.

Have been those packages released by error? Or for some reason my update is not complete?