How to install Flash on Debian Stretch?

I'm using Debian Stretch and would like to install flashplugin-nonfree. My apt/sources.list file contains deb http://ftp.ca.debian.org/debian/ stretch main contrib non-free deb-src http://ftp.ca.debian.org/debian/ stretch main contrib non-free deb http://security.debian.org/debian-security stretch/updates main contrib non-free deb-src http://security.debian.org/debian-security stretch/updates main contrib non-free # stretch-updates, previously known as 'volatile' deb http://ftp.ca.debian.org/debian/ stretch-updates main contrib non-free deb-src http://ftp.ca.debian.org/debian/ stretch-updates main contrib non-free deb http://download.virtualbox.org/virtualbox/debian stretch contrib deb http://www.deb-multimedia.org stretch main non-free deb [arch=i386,amd64] http://mariadb.mirror.globo.tech/repo/10.2/debian stretch main But when I run sudo apt-get install flashplugin-nonfree, I get this error message: sudo apt-get install flashplugin-nonfree Reading package lists... Done Building dependency tree Reading state information... Done Package flashplugin-nonfree is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'flashplugin-nonfree' has no installation candidate I tried to do an update or commenting everything except the first line in my apt/sources.list but still have the same error message. Any idea on how to install it anyway?