Ubuntu Security Notice 2781-1 - Multiple security issues were discovered in MySQL and this update includes new upstream MySQL versions to fix these issues. MySQL has been updated to 5.5.46 in Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. Ubuntu 15.04 and Ubuntu 15.10 have been updated to MySQL 5.6.27. In addition to security fixes, the updated packages contain bug fixes, new features, and possibly incompatible changes. Various other issues were also addressed.
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