[SAC] [OSGeo] #2664: Upgrade osgeo3-nginx to Ubnutu 20.04 and nginx 1.18

[OSGeo]

#2664: Upgrade osgeo3-nginx to Ubnutu 20.04 and nginx 1.18
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 Reporter:  robe           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:  Sysadmin Contract 2021-II
Component:  Systems Admin  |   Keywords:
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 I don't know what server I was looking at.

 Looks like osgeo3-nginx IS running Ubuntu so I do need to up the nginx on
 it.

 I'll start that shortly.  Shouldn't be too much interruption.

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2664>
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