Sometimes you may need to prevent a package from upgrading on your Debian or Ubuntu server. You can accomplish this by creating a file in the /etc/apt/preferences.d/ folder called “no-upgrade”. The name of the file does not matter.
In this example, the package init is what we want to prevent from upgrading. If you are using Ubuntu, use this line instead, “Pin: release o=Ubuntu”
Package: init Pin: release o=Debian Pin-Priority: -1