Could you please help to check below error, thank you!
ubuntu@ubuntu-VirtualBox:~$ rostopic list
ubuntu@ubuntu-VirtualBox:~$ sudo apt install ros-kinetic-magni-robot
Reading package lists… Done
Building dependency tree
Reading state information… Done
ros-kinetic-magni-robot is already the newest version (0.2.1-0xenial-20171208-085656-0800).
The following packages were automatically installed and are no longer required:
libllvm4.0 libtinyxml2-dev python-wxtools snapd-login-service
Use ‘sudo apt autoremove’ to remove them.
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
ubuntu@ubuntu-VirtualBox:~$ roslaunch magni_viz view_robot.launch
[view_robot.launch] is neither a launch file in package [magni_viz] nor is [magni_viz] a launch file name
The traceback for the exception was written to the log file