Hello,
I made a rollback (VM) and fired upgrade again. This is the only error so far:
The management daemon refused access. The API key file may be out of sync. Try ‘service mailinabox restart’.
When trying to restart the daemon manually got this:
It seems the stored PID is not the same as it should:
So I rolled back again, edited the file with the PID, wrote the proper one and launched setup again. This time no errors and finally in 0.23a.
Thanks all.