5.2 Preparing for upgrade
You can upgrade from one distribution to another one by fetching packages over
the network. This can be done as follows.
Get a clean list of repositories for stable:
# cd /etc/apt
# cp -f sources.list sources.list.old
# :>sources.list
# apt-setup noprobe
If you want to upgrade to testing then add testing
sources to this new list. If you want to upgrade to unstable then
also add unstable sources.
# cd /etc/apt
# grep -e "^deb " sources.list >srcs
# :>sources.list
# cp -f srcs sources.list
# sed -e "s/stable/testing/" srcs >>sources.list
# sed -e "s/stable/unstable/" srcs >>sources.list
# apt-get update
# apt-get install apt apt-utils
See
Beginning Debian package
management, Section 6.2 for the art of tuning
/etc/apt/sources.list and /etc/apt/preferences.
