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mkdir -p /catkin_ws/src
you're missing the ~ (or tilde), which refers to your home directory on Linux.
Right now you're trying to create a directory in the root of your filesystem, which is typically not something you can do as an ordinary user.
You'll want to run something like this:
mkdir -p ~/catkin_ws/src
or (equivalent):
mkdir -p $HOME/catkin_ws/src
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