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.
Follow this link to carry out md5checksum https://help.ubuntu.com/community/HowToMD5SUM
To print the system information of Ubuntu, use the “uname” command.
$ uname -a (prints all system information)
To just know the bus architecture of the machine to facilitate which version of ubuntu to be downloaded, use
$ uname -m
