[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 2020-III
Component:  Systems Admin  |   Keywords:
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 All the LXD hosts are currently running Ubuntu 18.04 which isn't horrible
 but if we wait too long it becomes harder and harder to upgrade.

 I did a trial run on another lxd server I have running 18.04 and took
 around 30 minutes - 1 hr with interruptions answering questions.

 I'll try with OSGeo4 first since that is a dev server.

 Although I was checking if lxd containers were unreachable while the
 upgrade was going on.  I'll check on OSGeo4 while I'm doing it

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