Cannot update Joomla v3 to v4 (Update Unavailable)

Issue

Joomla is refusing to download an update from V3.10 to V4.3. After enabling the Joomla Next update channel, the following message is displayed:

Joomla Update Unavailable

Update unavailable
An update to Joomla 4.3.4 was found, but it wasn’t possible to download that update. There are three possibilities why this happens:
– Your host doesn’t support the minimum requirements for Joomla 4.3.4 and there is no alternative download for your configuration available
– The update to Joomla 4.3.4 is not available for your stability level.
– There is a problem with the Joomla Update Server.

Resolution

The issue was caused by an unsupported MariaDB / MySQL version (<5.6) running on the host server. Updating the database engine to v10.3 resolved the issue.

September 2023
Joomla 3.10
Joomla 4.3