Merge pull request #724 from Luoxcat/master

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Update Daily Ubuntu Tips – How To Manually Install LibreOffice In Ubuntu.md
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Merge pull request #738 from yechunxiao19/patch-7

Update Daily Ubuntu Tips – How To Manually Install LibreOffice In Ubuntu...
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Merge pull request #739 from yechunxiao19/master

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Merge pull request #740 from runningwater/master

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