[SAC] [OSGeo] #2538: Upgrade OSGeo3, OSGeo4, OSGeo7 hosts to Ubuntu 20.04

[OSGeo]

#2538: Upgrade OSGeo3, OSGeo4, OSGeo7 hosts to Ubuntu 20.04
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 Reporter:  robe           |       Owner:  sac@…
     Type:  task           |      Status:  new
 Priority:  normal         |   Milestone:  Sysadmin Contract 2021-II
Component:  Systems Admin  |  Resolution:
 Keywords:                 |
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Comment (by robe):

 So osgeo7 is the only one of the hosts not at 20.04. Upgrading requires
 reboot and osgeo7 has the most apps on it.  I'm planning to wait till like
 December 31st with the hope that the 10-30 minute downtime will not impact
 people too much.

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2538#comment:6>
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