[SAC] [OSGeo] #2823: Upgrade osgeo6 to bullseye

[OSGeo]

#2823: Upgrade osgeo6 to bullseye
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 Reporter:  robe      |       Owner:  sac@…
     Type:  task      |      Status:  new
 Priority:  normal    |   Milestone:  Sysadmin Contract 2023-I
Component:  SysAdmin  |  Resolution:
 Keywords:            |
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Comment (by robe):

 Great.  I'll set up a backup of osgeo6 as I have done before and we can
 experiment with that. I think I'll need to put on osgeo7 since that has
 the most space.  There is still a lot of junk on osgeo6 that last time I
 replicated the server, I couldn't easily filter out.  But now that grass
 and grasswiki is moved, we can probably chuck all of that (though I think
 I already filtered those out anyway)
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2823#comment:3>
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