[SAC] [OSGeo] #2894: Update of grass.osgeo.org to Debian 11

[OSGeo]

#2894: Update of grass.osgeo.org to Debian 11
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 Reporter:  neteler        |       Owner:  sac@…
     Type:  task           |      Status:  new
 Priority:  normal         |   Milestone:  Sysadmin Contract 2023-I
Component:  Systems Admin  |  Resolution:
 Keywords:  debian         |
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Changes (by robe):

 * milestone:  Unplanned => Sysadmin Contract 2023-I

Comment:

 It swould follow the same process as any other server, but I can take care
 of it if you want.

 I think the last upgrade you had done yourself from debian 9 to debian 10.
 But given I did run into issues with upgrading some other 10s to 11,
 perhaps I should take care of it so I can roll back if issues.

 I'll do a trial run on a back up of it on staging, and if looks good I'll
 make the change here.

 Usually doesn't take more than 2 hrs (of which at most about 1 hr
 downtime).
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2894#comment:1>
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