The Kunena team has announce the arrival of Kunena 7.0.4 [K 7.0.4] in stable which is now available for download as a native Joomla extension for J! 5.4.x/6.0.x. This version addresses most of the issues that were discovered in K 6.2 / K 6.3 / K 6.4 and issues discovered during the last development stages of K 7.0
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Question
[Resolved] "There are no categories in the section!" after migration j1.5 > j2.5 Kunena 1.7.2
Kunena cannot be manually migrated from Joomla! 1.5 to Joomla! 2.5 -- category permissions need to be mapped between different versions of Joomla. All the extensions face the same issue if they store either access levels or user groups into database.
jUpgrade does this for you. If you just copy Kunena over, you need to do it manually for all the categories.
Those who can read some code, you should check administrator/components/com_kunena/install/j25upgrade.php on how to make the conversion.