In The Name Of God
Thanks alot for you'r attentions and your guides .
Yes , at fisrt i installed debian on my friend system for the first time ,and cause of DVD was corruption ,installing failed .
I had another DVD that was ok ,debian installed completely with that .
But now in loading debian i face this
And i always installed debian on other systems with this DVD without any problem .
So .DVD is ok , and i have rebooted this system for several times but all stops with this error.