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Ignoring file 'ros-latest' in directory '/et/apt/sources.list.d/' as it has no filename extention filename extension
Perhaps surprisingly, this error seems to be pretty explanatory by itself.
The ros-latest file in /etc/apt/sources.list.d is supposed to have a .list extension, and it doesn't on your machine.
If with step 1.4 you are referring to the Installation step in the installation manual, then you may have made a mistake in step 1.2 - Setup your sources:
Setup your computer to accept software from packages.ros.org.
sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'
Notice the .list extension there.
To resolve this, you could do something like the following:
sudo mv /etc/apt/sources.list.d/ros-latest /etc/apt/sources.list.d/ros-latest.list
then try sudo apt-get update again.
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