Downgrade a Package via apt-get
You can downgrade a package via apt-get. If you have the version number, or the target release, apt-get supports choosing a particular version or target release.
sudo apt-get install <package-name>=<package-version-number>
OR
sudo apt-get -t=<target release> install <package-name>
is the command to be run. This can be used to down-grade a package to a specific version.
You can list all available versions by doing:
apt-cache showpkg <package-name>
As an alternative this:
apt-mark hold <package-name>
"holds" the package at the current version, preventing automatic upgrades.