%0 Journal Article %T Package upgrades in FOSS distributions: details and challenges %A Roberto Di Cosmo %A Stefano Zacchiroli %A Paulo Trezentos %J Computer Science %D 2009 %I arXiv %R 10.1145/1490283.1490292 %X The upgrade problems faced by Free and Open Source Software distributions have characteristics not easily found elsewhere. We describe the structure of packages and their role in the upgrade process. We show that state of the art package managers have shortcomings inhibiting their ability to cope with frequent upgrade failures. We survey current countermeasures to such failures, argue that they are not satisfactory, and sketch alternative solutions. %U http://arxiv.org/abs/0902.1610v1