If you setup a Laptop with 15.XX and a luks encrypted SSD, you did set on older OS „tmpfs“ for /tmp. Now under „systemd“ the the boot hangs cause systemd „automount“ tmpfs to /tmp by default!!! If you enter tmpfs into fstab like on ubuntu 14.10, the OS boots into the „RECOVERY RESCUE MODE“ Here some details, from a forum post: Disable automatic mount Under systemd, /tmp may be automatically mounted as a tmpfs even though you have no entry for that in your /etc/fstab. To disable the automatic mount, run: # systemctl mask tmp.mount Files will no longer be […]