up vote 7 down vote favorite

I think I was installing a bunch of updates, and after what seemed like an hour or so, I finally got this message in the Terminal window:

cryptsetup: WARNING: failed to detect canonical device of overlayfs
cryptsetup: WARNING: could not determine root device from /etc/fstab

What does this mean, and how do I fix it?

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Also, it is still working on something. How long should this take? – Maegan Jul 4 '13 at 22:30
    
How are you updating? Are you using command line? – BiggJJ Jul 4 '13 at 22:46
    
check this out askubuntu.com/questions/87437/… – Projjol Jul 5 '13 at 5:43
    
"I think I was installing a bunch of updates" -- what exactly did you do? (which command, which program). Also, post the contents of the file /etc/fstab (open a terminal, and type cat /etc/fstab). – January Jul 5 '13 at 6:42
up vote 4 down vote

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 update-grub
sudo grub-install /dev/<your_device_id>
sudo reboot

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.

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