Check /var/log/mysql.log for the cause of the error. I'm not sure what you did previously, but you may be better off starting completing over, and making sure that all the config files are purged. It looks like you reinstalled after deleting the /var/lib/mysql folder manually. If the config files were still in place the install may have assumed it did not need to create that directory. I don't know what else that may have borked.
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