Closing as expired since this was against Apache 2.2 and php5 but all supported Ubuntu releases are on Apache 2.4 and php7 now.
It doesn't look like a stack trace was collected but from the comments and log files it kind of sounds like an incompatibility between apache and some other components.
If anyone is having this or a similar problem on current versions of Ubuntu, please file a new bug report with fresh logs and stack trace.
Closing as expired since this was against Apache 2.2 and php5 but all supported Ubuntu releases are on Apache 2.4 and php7 now.
It doesn't look like a stack trace was collected but from the comments and log files it kind of sounds like an incompatibility between apache and some other components.
If anyone is having this or a similar problem on current versions of Ubuntu, please file a new bug report with fresh logs and stack trace.