Hi! So this error occurs when the debian file can't be opened correctly - most commonly either the download is incomplete and hence corrupt, or sometimes the browser deletes the download when you close your browser before software-center has finished dealing with it. Could you perhaps try to download the deb file again and see if it works this time? Thanks!
** 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/854164 Title: Internal Error: deb file could not be opened. Status in “software-center” package in Ubuntu: Incomplete Bug description: When trying to open a deb file I just downloaded I get this error from the Software Centre: Internal Error The file "/home/me/Downloads/opera_11.51.1087_i386.deb" could not be opened. 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 NonfreeKernelModules: nvidia ApportVersion: 1.23-0ubuntu1 Architecture: i386 Date: Mon Sep 19 16:25:54 2011 InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110909) PackageArchitecture: all ProcEnviron: LANGUAGE=en_CA:en PATH=(custom, no user) LANG=en_CA.UTF-8 SHELL=/bin/bash SourcePackage: software-center UpgradeStatus: Upgraded to oneiric on 2011-09-13 (6 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/854164/+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