If you are using an old version, you could try to update and see if it solves the problem.
It is possible that your issue is a bug solved in more recent versions.
I suggest you to carefully read theses articles about repositories, especially the explanations about third party repos.
While using external repositories, keep in mind that the software there could not be properly tested, can have stability issues and cause problems to your systems. Once you have read and understood how repositories work, to upgrade your software, I suggest you to enable the Kubuntu Backports repo, which contains the latest version not only to Akregator but of the full KDE software collection, so be prepared to download a large amount of packages.
An easy way to enable it is with the command
sudo apt-add-repository ppa:kubuntu-ppa/backports