If you don't use " Source code packs", please "Uncheck" all "Source" packages.
Sometimes you may need to wait & try again ( updating)
Or if it continues, please try a server near you in ( "Software & Updates" )
Many of the warnings are for "configured multiple times"
This means that you have added the same repository several times.
You need to clean out the extras.
Without a closer look, I cannot be sure if your duplicate repositories are in
/etc/apt/sources.list
or if you have others in
/etc/apt/sources.list.d
(The .d shows that it is a Directory).
You can elevate to Root
sudo -i
nautilus
Then navigate to the above directories or do all in terminal, whichever you find most comfortable.
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