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I'm trying to install library using (sudo apt-get install python-tk ) this error appears

E: The list of sources could not be read.
E: Malformed line 1 in source list /etc/apt/sources.list.d/gazebo-stable.list (type)

and i don't know what should be written in this file currently this is written in it

deb 
http://packages.osrfoundation.org/gazebo/ubuntu-stable focal 
main
steeldriver
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