I would like to point out an issue about the systemd initialisation system under Debian Jessie.

Symptoms: the initialisation system enters an infinite loop while checking partitions.

To fix this issue:

-Verify that the problem concerns /etc/fstab - Edit the GRUB kernel command (enter edit mode with the "e" key) and remove the "quiet" parameter.

-You can use a live system like SystemRescueCD (console mode) to delete all the auto instances of the /etc/fstab file relating to file systems which are permanently connected to the system (such mass storage peripherals..).

-You can also add the noauto parameter in the mount options.

Learn more about this issue: LinuxQuestionrg.