The 'Plugins' link (Administration -> System -> Plugins) is missing after upgrading to 4.3 or later version.
The cause is a known bug that has been fixed in JIRA 5.0.5, JRA-24218 - UPM doesn't get enabled on upgrade to 4.3 Resolved
JIRA 4.3+ bundles the Universal Plugin Manager and uses it to manage all bundled and extension plugins. Normally, we may see the above scenario when one has installed and disabled UPM Plugin in the old JIRA instance (before 4.3) and then upgraded to 4.3 or a later version.
- Stop JIRA.
Run the following SQL against the JIRA database to re-enable the plugin:
- Start JIRA and test to see if the UPM is accessible.
If there are any problems with the SQL update, please rollback JIRA to the backup immediately so as to avoid any possible data integrity issues.