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its the dvd

I ran into the same problem. kept getting the same error msg as you. i luckily had a 2nd mac handy and reburned the dvd. installed like a charm. don't dismiss that it is the disk.....
 
Are you trying to install on an encrypted disk? I was having the same problem but reformatting as HFS+ (journaled) instead of HFS+ (journaled, encrypted) made it work like a charm.
 
Well you guys were right specially Firesokar... I ran the log and apparently additionalspeechvoices.pkg was corrupted or damaged... So I downloaded Lion again on another computer and installed on a USB stick and worked like a charm!!!

Thanks Guys!
 
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