An upgrade is an absolute system-wide version change, it may be of all the software’s and applications within your Linux distribution. In an upgrade, your dedicated server may get a new kernel version, libraries, software packages or may consists of new configuration file changes. Most of the times, old version packages are not compatible with the new one.

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Hence, when upgrading your dedicated server, you need to be very careful. Unless it is mandatory to upgrade the server, you should avoid it upgrading. Upgrade only when there is a new and stable version of Linux is available. Else, just maintain the old version properly with new updates released.