hi,
i new for linux, and i boot my pc from cd, then i find out result for failed md5sum files, can i repair these failed md5sum files with QuickPar appl?
thanks............

You shouldn't. The md5sum files are provided as a security measure to make sure you downloaded certified original files.

If you're getting those errors, you should download the files from another source.

ok, i'll redownload the files and thanks

An "MD5 sum" is a fancy way of checking that a file has not been altered (or received in a corrupted state). It is a mathematical formula which is very good at detecting when even a single bit of a file has been altered. If the MD5 checksums do not match, you know something's wrong with what you downloaded.

A more sophisticated way of verifying that a file really is what you expect it to be is done by checking the file's signature using a public-key cryptography tool such as openssl. This is similar to MD5, except that it is not possible to supply an intentionally-incorrect check. This method not only determines that a file has not been altered, but also that it exactly matches what the person who signed it intended to provide.