You can use APT pinning to accomplish this (http://wiki.debian.org/AptPinning)
Create file /etc/apt/preferences with contents
Code:
Package: *
Pin: release a=feisty
Pin-Priority: 1001
Package: *
Pin: release a=feisty-updates
Pin-Priority: 1001
Package: *
Pin: release a=feisty-proposed
Pin-Priority: -10
Priority over 1000 allows downgrading. This should make apt believe that packages from feisty and feisty-updates are newer.
To simulate
Code:
sudo aptitude -s upgrade
To perform the downgrade
Code:
sudo aptitude upgrade
Bookmarks