I just reinstalled the stack and then went into Settings/Network and selected the attached network adapter as 'Bridged Adapter' eth0. However, when I then started the machine, I saw several errors during boot, saying 'Cannot find device eth0' and 'Cannot start eth0', 'Interface eth0 is not up'. There is also an error message saying 'Failed services in run level 3: network bitnami-stats-chron'
I get the same errors if I try the setting as NAT, which was the setting I used previously. This originally had no errors during boot, but I was unable to access the Joomla server, as I previously mentioned.
It appears that when I deleted the original VM installation, something got left behind which is causing the current problem.