[RTEMS Project] #3416: Update Ubuntu RSB Instructions for 17.10

[RTEMS trac]

#3416: Update Ubuntu RSB Instructions for 17.10
---------------------------+---------------------
 Reporter:  Joel Sherrill  |       Owner:  (none)
     Type:  defect         |      Status:  new
 Priority:  normal         |   Milestone:  5.1
Component:  tool           |     Version:  5
 Severity:  normal         |  Resolution:
 Keywords:                 |  Blocked By:
 Blocking:                 |
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Comment (by Joel Sherrill):

 The documentation changes did not include information on "Error :: You
 must put some 'source' URIs in your sources.list" being reported. As this
 occurred on an Ubuntu version that was not
 LTS, it is not being added. If this error occurs in the future on a LTS
 release, then add this information.

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Ticket URL: <http://devel.rtems.org/ticket/3416#comment:4>
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