Lucent, Unions Have Tentative Agreement  CHICAGO (Reuters) - Lucent Technologies Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=LU.N target=/stocks/quickinfo/fullquote"&gt;LU.N&lt;/A&gt; on  Tuesday said it reached a tentative labor agreement with the  two unions representing about 10 percent of its work force,  ending a month of bargaining over a range of issues including  health care.