this bug really needs to be fixed. i do not have enough experience to fix it but i can say that i have tried debs in multiple directories and i always get the internal error message. i have installed gdebi for now.
** Attachment added: "Here it what the internal message is." https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/858246/+attachment/2536576/+files/Screenshot%20at%202011-10-11%2011%3A20%3A37.png -- 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/858246 Title: Software center cannot install opera deb file: Internal Error Status in “software-center” package in Ubuntu: Confirmed Bug description: I just tried to install opera from the provided deb package. Unfortunately, software-center always displayed an “Internal Error”: “The file x could not be opened”. I checked the file is okay by installing it with dpkg, which worked fine. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: software-center 4.1.23.3 ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4 Uname: Linux 3.0.0-11-generic i686 ApportVersion: 1.23-0ubuntu1 Architecture: i386 Date: Sat Sep 24 16:07:13 2011 InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110803.1) PackageArchitecture: all SourcePackage: software-center UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/858246/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

