PackageKit maintains a log of the transactions that it performs. To view the log, from the Add/Remove Software window, click System → Software log, or run the gpk-log command at the shell prompt.

The Software Log Viewer shows the Action, such as Updated System or Installed Packages, the Date on which that action was performed, the Username of the user who performed the action, and the front end Application the user used (such as Update Icon, or kpackagekit). The Details column provides the types of the transactions, such as Updated, Installed or Removed, as well as the list of packages the transactions were performed on.

Typing the name of a package in the top text entry field filters the list of transactions to those which affected that package.