Update to latest upstream version.
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The 5.6.16 stable kernel update contains a number of important fixes across the tree.
Multiple security issues have been found in Thunderbird which could result in the setup of a non-encrypted IMAP connection, denial of service or potentially the execution of arbitrary code.
Three vulnerabilities have been found in the MySQL Connector/J JDBC driver. For the oldstable distribution (stretch), these problems have been fixed