Recently we suffered a crash of Ubuntu. After trying to boot the system back up we are being asked to Unlock the disk /dev/disk/by-uuid/de2ce-fdsfsd-etc and a prompt to enter in a passphrase. None of us remember ever creating a passphrase for this. Is this something that's turned on by default on Ubuntu and how do I remove this so I can get this system booted back up?
It sounds like the file system was encrypted with LUKS.
Unfortunately, there is no way to get pass it unless you know the passphrase to decrypt the file system.