Enter disk description passphrase

[fxc]

Hi everyone 
 I was at the process Linux installation, after hours ,I have this error 
"Enter disk decryption passphrase "
With any try ,I wasn't successful and I don't know what do I do ?

Thanks

Your post lacks a lot of information, like which distribution, what you've tried so far, what didn't work and so on. Would recommend to add more information - usually one can always expect other people to put at least effort into helping as there was effort put into the post.