| Note |
|---|
When performing an upgrade is always a good idea to backup your production system. It is also good to perform the update on a test system first in order to prevent undesired situations. |
| Warning |
|---|
There is a bug in 4.0.4 that breaks upgrading using the web user interface. Specifically, it disables use of the CentOS repositories during the upgrade, which causes some prerequisites to be unavailable, which makes the upgrade fail. The bug has been fixed in 4.2 (and a bunch of other improvements to the upgrade interface have been made too). |
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