Binary package hint: ubuntu-docs
https://translations.launchpad.net/ubuntu/jaunty/+source/ubuntu-docs/+pots/hardware/hu/61/+translate
<ulink url="apt:system-cleaner-gtk">Install <application>Cruft Remover</application></ulink> and run it by clicking <menuchoice><guimenu>System</guimenu><guisubmenu>Administration</guisubmenu><guisubmenu>Cruft Remover</guisubmenu></menuchoice>. This will remove unused or obsolete software packages from your computer. Read the list of packages carefully before you click <guibutton>Cleanup</guibutton>; packages that you have manually downloaded and installed may be listed as unused, even though they are not.
Located in hardware/C/hardware.xml:156(para)
system-claner was recently renamed to Computer Janitor, and the package to install is computer-janitor-gtk now: https://launchpad.net/ubuntu/jaunty/+source/computer-janitor
Fix committed to our jaunty branch. Thanks for the bug report.