A quick note on the links related where to find the ubuntu releases and how to do a checksum to ensure that the downloaded copy
If you are downloading Ubuntu from the official site,
MD5/SHA1 checksum (ubuntu hashes) for latest releases may not be listed there.
If it is not there, you can visit the site
http://releases.ubuntu.com/. This site lists a comprehensive list of ubuntu releases and their checksums.
Checksums ensure that the download is complete without corruption and is 100% accurate. So, it is always advisable to do a checksum after each download.
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