apt-get force reinstall package

The syntax is:
apt-get --reinstall install PackageNameHere
apt-get --reinstall install Package1 Package2
The --reinstall option re-install packages that are already installed and at the newest version.

Pro 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:
mkdir /root/nginx.mmddyyyy/ && 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 rsync
OR
# apt-get --reinstall install rsync
Sample outputs:

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

The 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 nginx

What if I want to reinstall ALL packages …

You need to use the aptitude command as follows:
sudo aptitude reinstall '~i'

Conclusion

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 pager here:

• See man pages for more info – cp(1)