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Iam a new Debian Linux / Ubuntu Linux LTS user. How do I reinstall a package using apt-get command line? Is there an 'apt-get force reinstall package' command? How do I force reinstall apt-get?

The Advanced Packaging Tool (APT) works on both Debian / Ubuntu Linux. It can handle the installation and removal of software including reinstalling packages to fix problems. You need use apt-get command as follows to forcefully reinstall package. This page shows to reinstall packages on an Ubuntu and Debian server or cloud based virtual machine.
apt-get force reinstall package
The syntax is as follows for the apt command/apt-get command to force reinstall:
apt-get --reinstall install PackageNameHere
apt --reinstall install pkg1
apt-get --reinstall install Package1 Package2The --reinstall option re-install packages that are already installed and at the newest version. This is also useful when you removed / uninstalled packages like Nginx but want to reinstall it again.

QuotePro tip: Backup all configuration files before reinstalling packages. For example, if you are reinstalling nginx web server package, backup /etc/nginx/ directory with the help of cp command as follows:
sudo mkdir /root/nginx.mmddyyyy/
sudo cp -avr /etc/nginx/* /root/nginx.mmddyyy/

How to reinstall a package using apt-get
Let us see some example that shows how to reinstall package and its installed dependencies on a Debian or Ubuntu Linux. The following command will reinstall rsync package. Open a terminal application and then type:
sudo apt-get --reinstall install rsyncapt-get --reinstall install rsync(https://pix.cobrasoft.org/images/2023/01/10/apt-get-reinstall-command.webp)
If above method failed for you, try the following syntax. Make sure you backup config file before typing the following commands. Please note that the --purge option is identical to remove except that packages are removed and purged including any configuration files are deleted too.
sudo apt-get --purge remove package1
sudo apt-get install package1
Debian or Ubuntu reinstall package command
Type the following apt command or apt-get command to reinstall htop:
sudo apt --reinstall install htop

OR
sudo apt-get --reinstall install htop(https://pix.cobrasoft.org/images/2023/01/16/img6.png)
he apt-get is the command-line tool for handling packages. The apt command provides a high-level command-line interface for the package management system. It is intended as an end user interface. Both, apt command and apt-get accepts the --reinstall option for reinstalling packages to fix problems.

apt-get reinstall package and dependencies
One can use aptitude command too. The syntax is:
sudo aptitude reinstall pkg
sudo aptitude reinstall nginxConclusion
You learned how to use the apt-get to force reinstall package on a Debian and Ubuntu Linux. For more information please apt-get man page here or use the man command to read it offline on your computer:
man apt
man apt-get
man dpkg
man cp