Warnings upgrading from Joomla 2.5 to 3.x

From Joomla! Documentation

When updating from the 2.5 series to the 3 series you may see a large number of warnings and notices on the update page.

Versions affected

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General Information

This pertains only to Joomla! version(s):- 3.0.x  3.1.x

What is the cause

Not specified.

What is the fix

These do not interfere with the update process and may simply be ignored.