I ran the commands that you suggested, but I had a problem with the last
command.
sudo aptitude install gstreamer1.0
I got this message from Terminal after running the command.
"Couldn't find package "gstreamer1.0", and more than 40
packages contain "gstreamer1.0" in their name.
Couldn't find package "gstreamer1.0", and more than 40
packages contain "gstreamer1.0" in their name.
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used."
