How To Install libqpdf21 on Ubuntu 18.04
Introduction
In this tutorial we learn how to install libqpdf21 on Ubuntu 18.04.
What is libqpdf21
libqpdf21 is:
QPDF is a program that can be used to linearize (web-optimize), encrypt (password-protect), decrypt, and inspect PDF files from the command-line. It does these and other structural, content-preserving transformations on PDF files, reading a PDF file as input and creating a new one as output. It also provides many useful capabilities to developers of PDF-producing software or for people who just want to look at the innards of a PDF file to learn more about how they work.
QPDF understands PDF files that use compressed object streams (supported by newer PDF applications) and can convert such files into those that can be read with older viewers. It can also be used for checking PDF files for structural errors, inspecting stream contents, or extracting objects from PDF files. QPDF is not PDF content creation or viewing software – it does not have the capability to create PDF files from scratch or to display PDF files.
This package contains the qpdf runtime libraries required to run programs that link with the qpdf library.
There are three methods to install libqpdf21 on Ubuntu 18.04. We can use apt-get, apt and aptitude. In the following sections we will describe each method. You can choose one of them.
Install libqpdf21 Using apt-get
Update apt database with apt-get using the following command.
sudo apt-get update
After updating apt database, We can install libqpdf21 using apt-get by running the following command:
sudo apt-get -y install libqpdf21
Install libqpdf21 Using apt
Update apt database with apt using the following command.
sudo apt update
After updating apt database, We can install libqpdf21 using apt by running the following command:
sudo apt -y install libqpdf21
Install libqpdf21 Using aptitude
If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude using the following command.
sudo aptitude update
After updating apt database, We can install libqpdf21 using aptitude by running the following command:
sudo aptitude -y install libqpdf21
How To Uninstall libqpdf21 on Ubuntu 18.04
To uninstall only the libqpdf21 package we can use the following command:
sudo apt-get remove libqpdf21
Uninstall libqpdf21 And Its Dependencies
To uninstall libqpdf21 and its dependencies that are no longer needed by Ubuntu 18.04, we can use the command below:
sudo apt-get -y autoremove libqpdf21
Remove libqpdf21 Configurations and Data
To remove libqpdf21 configuration and data from Ubuntu 18.04 we can use the following command:
sudo apt-get -y purge libqpdf21
Remove libqpdf21 configuration, data, and all of its dependencies
We can use the following command to remove libqpdf21 configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge libqpdf21
References
Summary
In this tutorial we learn how to install libqpdf21 package on Ubuntu 18.04 using different package management tools: apt, apt-get and aptitude.
