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Please be specific when asking for help, you simply stated only part of what the actual error log contained.
We need to see what is in your Launcher Log, which can be found on the second tab of the launcher.
First, copy all of the text (right click on any empty space, press "Copy All Text").
Then, go to http://paste.ubuntu.com/ and paste it. Click 'Create Paste', then share with us the link (the URL) that it takes you to.