I used UNetbootin to make a bootable USB to install Ubuntu 10.4 TLS, during installation, at 55%, I got an error [errn5] or something like that, next time I rebooted, I checked the disk to see if there's errors, at the end it said " error in 1 file ", what now ? How do I fix it? How do I know which file?
I would check the md5sum of your downloaded iso.
If it fails that - you will have to redownload it, preferably with a torrent - that will make sure your download is good.