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Try apt update - you may get other packages
No real harm can be done if you delete the files mentioned
/var/cache/apt/archives/capplets-data_1%3a2.20.1-0ubuntu1_all.deb
/var/cache/apt/archives/gnome-control-center_1%3a2.20.1-0ubuntu1_i386.deb
/var/cache/apt/archives/gnome-utils_2.20.0.1-0ubuntu1_i386.deb
Then apt install again
This way the packages are new in case the present are corrupt