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Ubuntu 14.04 running on a Dell E6410 $ uname -a Linux E6410 3.13.0-92-generic #139-Ubuntu SMP Tue Jun 28 20:42:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux Open the file with Ubuntu Software Centre: "The installation of a package which violates the quality standards isn't allowed. This could cause serious problems on your computer. Please contact the person or organization who provided this package file and include the details beneath." Lintian check results for /home/me/Downloads/tiberiansunonline_1.0_all(1).deb: E: tiberiansunonline: maintainer-address-malformed CnCNet <@> Since it is just the publisher email address, I decided to click-through by "Ignore-and-install". Dialog box: "Package Operation failed The installation or removal of a software package failed. (Reading database ... (Reading database ... 5% (Reading database ... 10% (Reading database ... 15% (Reading database ... 20% (Reading database ... 25% (Reading database ... 30% (Reading database ... 35% (Reading database ... 40% (Reading database ... 45% (Reading database ... 50% (Reading database ... 55% (Reading database ... 60% (Reading database ... 65% (Reading database ... 70% (Reading database ... 75% (Reading database ... 80% (Reading database ... 85% (Reading database ... 90% (Reading database ... 95% (Reading database ... 100% (Reading database ... 1296253 files and directories currently installed.) Preparing to unpack .../tiberiansunonline_1.0_all(1).deb ... Unpacking tiberiansunonline (1.0) over (1.0) ... Setting up tiberiansunonline (1.0) ... /var/lib/dpkg/info/tiberiansunonline.postinst: 2: /var/lib/dpkg/info/tiberiansunonline.postinst: [[: not found sudo: unknown user: sudo: unable to initialize policy plugin dpkg: error processing package tiberiansunonline (--install): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: tiberiansunonline" This is the second time I tried downloading and installing (re-install second time). The problem is identical for both attempts.