On Mon 01 Oct 2018 at 13:08:10 +0800, Li Wei wrote: > i've installed jessie > instead of installing jessie's mplayer, can i install wheezy's mplayer? You could try. 1. Comment out all entries in /etc/apt/sources.list and add a single entry for a wheezy archive. 2. Purge mplayer if it is on the system. 3. apt update 4. apt install mplayer 5. Return sources.list to its previous state. -- Brian.