I need to install an older version of mono and followed the official tutorial where I added in /etc/apt/sources.list.d/mono-xamarin.list the following
deb http://download.mono-project.com/repo/ubuntu stable/snapshots/4.8.1 main
Updating the repository works out well. But when I try to install it via
sudo apt install mono-complete
or
sudo apt install mono-devel
I am not getting version 4.8.1 as specified but the newest version 6.8.
What am I doing wrong here and how do I force install the older version?