If you are not using enCRYPTED volumes or swap, then you don't need cryptsetup, just uninstall it and reboot using the following commands:
sudo apt-get remove cryptsetup
# it's better to update and reinstall GRUB before rebooting
sudo grub-install /dev/<your_device_id>
To find your device id, run:
and locate the
disk which contains a
partition mounted at
/boot/*. Note that you should use the device id (e.g.
/dev/sda), not the partition id (e.g.
To make sure you are not using crypted filesystems please check
/etc/fstab, if you see the option 'crypt' anywhere, then you require cryptsetup and what you need is to configure it properly.