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The Debian packages of ROS can be updated like any other Debian (Ubuntu) package, so your question is not only specific to ROS. What your error message means is that synaptic couldn't download the .deb files from the repository server. So either your network connection was down, or the server (packages.ros.org for ROS packages) was down.
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The Debian packages of ROS can be updated like any other Debian (Ubuntu) package, so your question is not only specific to ROS. What your error message means is that synaptic couldn't download the .deb files from the repository server. So either your network connection was down, or the server (packages.ros.org for ROS packages) was down.down, or the requested package was not found on the server (which would be very strange).
Do you get the error on ROS packages (i.e., those starting with ros-)? If you get the error on non-ROS packages, make sure you have enabled the "restricted", "universe" and "multiverse" Ubuntu repositories and refreshed the package lists.
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