The Ubuntu team pushes out updates to the distribution's long term support (LTS) releases on a regular basis to provide fresh installation media for users. These updated builds are not brand new versions of the operating system, but include additional drivers and packages with security fixes. The most recent update, Ubuntu 16.04.2, has been delayed twice now and the team plans to hold it back until February 9th to allow for further quality assurance testing. Leann Ogasawara explained the reason for the delay: "We would like to formally request an extension for 16.04.2's release. We have just identified a serious boot regression on arm64. The resolution looks to require landing changes to the kernel, flash-kernel, and possibly d-i. While we can likely physically get those changes into the archive in time for the release, there would be next to no time to test this nor provide appropriate regression testing on other platforms. We would be much more comfortable giving that some proper testing before releasing and therefore would like to request an additional extension for the point release date."