I just tried to reproduce this and it works for me with the mentioned package and test-case.
** Changed in: software-center (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to software-center in Ubuntu. https://bugs.launchpad.net/bugs/900371 Title: Incorrect parsing in Software Center's "already installed" dialog Status in “software-center” package in Ubuntu: Incomplete Bug description: Greetings, Dash opened and recommended the package Mathomatic, so I opened this in Software Center. There is an add-on below, which I checked to download as well. I then installed the main package. The window did not appear to have installed the add-on, so I clicked "Apply Changes" to install the add-on. A warning popped up saying that the package is already installed. No problem, but the "details" in the dialog were botched. Package is already installed There isn't any need for an installation \/ Details Package [dbus.String(u'rlwrap')] is already installed I certainly wasn't trying to install that package name :-P. Searched software center with a few keywords and did not find a duplicate. lsb_release -rd: Description: Ubuntu 11.10 Release: 11.10 apt-cache policy software-center: Installed: 5.0.2ubuntu0.1 Candidate: 5.0.2ubuntu0.1 Version table: *** 5.0.2ubuntu0.1 0 500 http://us.archive.ubuntu.com/ubuntu/ oneiric-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu/ oneiric-security/main amd64 Packages 100 /var/lib/dpkg/status 5.0.1.4 0 500 http://us.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages Not a big deal, but should be a quick fix, too. I tried to narrow down the bug location a bit, but got stuck. I apt-got the source for software-center and grep'd for the phrase "is already installed", but it did not reveal an obvious location. Perhaps this is a great opportunity for me to dig deeper and learn more about debugging software so I can contribute. If anyone has any pointers on how I would have approached this bug, I'd love to communicate with you. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/900371/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp