Upgrade to pfsense 2.3.1 in Hyper-v 2008 R2 failed - unbootable
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After upgrade to 2.3.1 pfsense canot boot with error:
Mounting from ufs:/dev/ad0s1a failed with error 19.
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The name of the root partition has probably changed to ada0s1a, try entering ufs:/dev/ada0s1a at the prompt.
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the right solution is here:
https://forum.pfsense.org/index.php?topic=109952.msg613371#msg613371