[ubuntu] Hash doesn't match for CD install

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http://ubuntuforums.org – Dell Inspiron 5150 w/ Windows XP Pro is running out of steam and has no room to grow. Not a HD problem nor Ram but OS problem. MS says I can't run Win7 (and most likely W8 ) so my only option was try Linux. Ubuntu seemed like a simple upgrade path but, boy, was that wrong! What is this nonsense about hash checking? I never had to do anyting remotely like that with any Windows package. And then the process doesn't work as advertised. This recommended program, winMd5sum, either doesn't know how to count or the online hash list is wrong. After two tries and most of a day and a half it still can' (Hardware)