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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?

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I would check the md5sum of your downloaded iso.

https://help.ubuntu.com/community/HowToMD5SUM

https://help.ubuntu.com/community/UbuntuHashes

If it fails that - you will have to redownload it, preferably with a torrent - that will make sure your download is good.

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In addition to checking the MD5SUM of the downloaded .iso file, if that doesn't reveal a corrupted file, then it's important to check the installation media itself (this applies to both CD/DVD media and to USB flash drives). –  Eliah Kagan Jun 17 '12 at 21:30
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