Thanks for taking the time to report this bug. 13.04 reached EOL on January 27,
2014.
Please see this document for currently supported Kubuntu releases:
https://wiki.kubuntu.org/Releases
Unfortunately this means that there will be no more bugfixes for 13.04.
It is also recommended that you
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1283882
Title:
package libkdecore5 4:4.10.5-0ubuntu0.1 failed to install/upgrade:
package libkdecore5 is not
