Set “Allow applications downloaded from:” to “Anywhere” and confirm by pressing “Allow From Anywhere”.
Open Gatekeeper settings located in “System Preferences > Security & Privacy”.Now, assuming you still want to install PDF Split And Merge even if you didn’t download it from the “safest and most reliable place”, what can you do? You have to: It does that by preventing you from launching apps that are not downloaded from the Mac App Store which is “The safest and most reliable place to download and install apps”. The issue is caused by a new feature of Mountain Lion and OS X Lion v10.7.5, called Gatekeeper which “help protect your Mac from malware and misbehaving apps downloaded from the Internet”. These latter features may be used to override decisions made by apt-get's conflict resolution system.Some of you reported the “PDFsam is damaged and can’t be opened” error when trying to install the PDF Split And Merge dmg package.Īfter some investigation and users feedback I can finally write what is causing that. Similarly a plus sign can be used to designate a package to install. If a hyphen is appended to the package name (with no intervening space), the identified package will be removed if it is installed. The /etc/apt/sources.list file is used to locate the desired packages. All packages required by the package(s) specified for installation will also be retrieved and installed. Each package is a package name, not a fully qualified filename. APT simplifies the process of managing software on Unix-like computer systems by automating the retrieval, configuration and installation of software packages, either from precompiled files or by compiling source code.Īpt-get is the command-line tool for handling packages, and may be considered the user's "back-end" to other tools using the APT library.Īpt-get install is followed by one or more packages desired for installation or upgrading. More information about install using apt-getĪdvanced Package Tool, or APT, is a free software user interface that works with core libraries to handle the installation and removal of software on Debian, Ubuntu and other Linux distributions.
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