This lets you upgrade all packages, for example, from version 1 of
the distribution to version 2. Here are a few general rules before performing an upgrade:
Back up data??”There is a possibility that after you finish your upgrade, the operating
system won??™t boot. It??™s always a good idea to back up any critical data and configuration
files (in /etc) before doing any major changes to your operating system.
Remove extra packages??”If there are software packages you don??™t need, remove them
before you do an upgrade. Upgrade processes typically upgrade only those packages that
are on your system. Upgrades generally do more checking and comparing than clean
installs do, so any package you can remove saves time during the upgrade process.
Check configuration files??”A Linux upgrade procedure often leaves copies of old configuration
files. You should check that the new configuration files still work for you.
Installing Linux from scratch goes faster than an upgrade. It also results in a cleaner
Linux system. So if you have the choice of backing up your data, or just erasing it if you
don??™t need it, a fresh install is usually best.
Some Linux distributions, most notably Gentoo, have taken the approach of ongoing updates.
Instead of taking a new release every few months, you simply continuously grab updated packages
as they become available and install them on your system.
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