We had done a PCI scan on one of our servers running Ubuntu 12.04 LTS with apache 2.2.22.The scan reported a vulnerability in apache 2.2.22 (Apache HTTP Server Zero-Length Directory Name in LD_LIBRARY_PATH Vulnerability).The report states to updgrade the version to the latest stable release of either 2.2.23 or 2.4.2.How do I upgrade to the 2.2.23…