"Could not start Jellyfin server process after the specified wait period."

[b4ttlesnake]

Can you share the contents of migrations.xml?

I am having this exact same problem. This is the new migrations.xml generated after deleting the corrupted one.
Server still not starting.

Code:

<?xml version="1.0" encoding="utf-8"?>
<MigrationOptions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Applied>
    <ValueTupleOfGuidString>
      <Item1>9b354818-94d5-4b68-ac49-e35cb85f9d84</Item1>
      <Item2>CreateNetworkConfiguration</Item2>
    </ValueTupleOfGuidString>
    <ValueTupleOfGuidString>
      <Item1>a6dcacf4-c057-4ef9-80d3-61cef9ddb4f0</Item1>
      <Item2>MigrateMusicBrainzTimeout</Item2>
    </ValueTupleOfGuidString>
    <ValueTupleOfGuidString>
      <Item1>4fb5c950-1991-11ee-9b4b-0800200c9a66</Item1>
      <Item2>MigrateNetworkConfiguration</Item2>
    </ValueTupleOfGuidString>
    <ValueTupleOfGuidString>
      <Item1>4124c2cd-e939-4ffb-9be9-9b311c413638</Item1>
      <Item2>DisableTranscodingThrottling</Item2>
    </ValueTupleOfGuidString>
    <ValueTupleOfGuidString>
      <Item1>ef103419-8451-40d8-9f34-d1a8e93a1679</Item1>
      <Item2>CreateLoggingConfigHeirarchy</Item2>
    </ValueTupleOfGuidString>
  </Applied>
</MigrationOptions>

[TheDreadPirate]

Also try renaming system.xml and let it regenerate from defaults.