Issue during 'roslaunch turtlebot_gazebo turtlebot_world.launch'

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Hello everybody!

I have Ubuntu 16.06 Xenial and ROS Kinetic installed. I want to launch gazebo turtlebot simulation with a command:

roslaunch turtlebot_gazebo turtlebot_world.launch

At first, I installed turtlebot using:

sudo apt-get install ros-kinetic-turtlebot ros-kinetic-turtlebot-apps ros-kinetic-turtlebot-interactions ros-kinetic-turtlebot-simulator ros-kinetic-kobuki-ftdi ros-kinetic-rocon-remocon ros-kinetic-rocon-qt-library ros-kinetic-ar-track-alvar-msgs

Then launching gazebo turtlebot simulation I got a typical error:

[turtlebot_world.launch] is neither a launch file in package [turtlebot_gazebo] nor is [turtlebot_gazebo] a launch file name
The traceback for the exception was written to the log file

After that I installed without deleting the previous turtlebot software:

sudo apt-get install ros-kinetic-turtlebot-gazebo

Everything was fine and then I tried again and got:

..

. logging to /home/aleks/.ros/log/98e51c20-20bd-11e8-91d8-ccb0dacbc15b/roslaunch-aleks-Aspire-E5-575G-15388.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

Invalid <arg> tag: environment variable 'TURTLEBOT_GAZEBO_WORLD_FILE' is not set
.
Arg xml is <arg default="$(env TURTLEBOT_GAZEBO_WORLD_FILE)" name="world_file"/>
The traceback for the exception was written to the log file