I fail to see anything obvious in the logs.
RC 10 is weird enough and not obvious to me where it comes from.
But searching the web I found that especially around php there were some hits.
@nacc could you take a second look?
Could also be a dup to bug 1433613
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package php5-mysql 5.5.9+dfsg-1ubuntu4.19 failed to install/upgrade:
subprocess installed post-installation script returned error exit
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