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I am using Ubuntu 14.04 but few weeks ago, it didn't accept my passphrase. I am sure I am putting it right. It contains special characters ))(( I tried to use live USB and the volume is shown as encrypted and again doesn't access the passphrase. Is there a way to solve this or to change the passphrase.

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If your passphrase contains the numbers and you use num-keypad to enter the numbers - be sure the NUMLOCK is on. I know it's stupid, but once I got 3-minutes troubleshooting job done to figure out that my disk is not accepting the passphrase just because of it....

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  • Many thanks Zoubak. I have tried this but still not accepting the password. Anything else I can do?
    – Cai Egy
    Nov 28, 2014 at 11:05
  • It seems that problem is serious. Sometime it happens the crypt header is corrupted (ex.: power failure). If you used luks encryption - the only remedy is to restore headers from previously saved back-up (if you fortunately did it) - just run sudo cryptsetup luksHeaderRestore /dev/sdXn --header-backup-file /path/your_header_backup_file. For ecryptfs system the procedure is different. Please let me know what encryption you used.
    – zoubak
    Nov 30, 2014 at 5:54

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