In case there's some important note to add to the upgrade process, the packages will alert the user, and often provide a solution to a possible problem.
You should also read the Release Notes document that describes the details of specific upgrades.
Note: Automatic upgrade of packages is NOT recommended in reduces the bandwidth requirements of Debian mirrors by restricting the frequency of Packages, Releases and Sources file updates from the back end and only doing a single fetch for any file, independently of the actual request from the proxy.
automatically builds a Debian HTTP mirror based on requests which pass through the proxy.
Even power users from other distributions probably share the same feelings, given the popularity and spread of tools like apt or apt-rpm which make it possible to have quick and frequent updates.
However, no distribution is more suited than Gentoo to satisfy these kind of demanding users.
The content of this file is the name of the profile that should be "upgraded to"; Portage uses this information to automatically warn administrators when they should update to a new profile.
There are various reasons that a new profile may be created: the release of new versions of core packages (such as sys-apps/baselayout, sys-devel/gcc, or sys-libs/glibc) that are incompatible with previous versions, a change in the default USE flags or in the virtual mappings, or maybe a change in system-wide settings.One of Debian's goals is to provide a consistent upgrade path and a secure upgrade process.We always do our best to make upgrading to new releases a smooth procedure.The profile in use is determined by the symbolic link .The files in the parent directories are part of the profile as well (and are therefore shared by different subprofiles). Profiles obsoleted by new ones are kept in is put in the profile directory.It is a well-known fact that Gentoo never got in touch with the "classic" way of upgrading software: waiting for a new release, downloading it, burning, putting it in the CD-ROM drive and then following the upgrade instructions.