This year Ubuntu switched over to using systemd in place of Upstart, other distributions have also decided to take advantage of systemd, this project hosted its first conference, and the systemd feature-set continued to expand.
Systemd in 2015 gained its own UEFI boot-loader, picked up more networking features, added fsck support, came up with its own su-like command, added more feature integration with Btrfs, and many other features came about while others were refined.
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