look at the admin tool, check what package it was installing at the time of the error box, then install that package manually on a target disk other than / and see what happens
installer -target /Volumes/otherOS -pkg ./packagewitherro -verboseR -dumplog
its almost always my fault when i see an error during compile, or a vendor package might need to be installed at firstboot, you can check that in the package properties.
the other errors are going to be errors you see when you run installer from the command line from packages that use old format packages instead of getting their receipts into the pkgutil format.
I think this was caused by having packages that were signed with the expired Apple certificate... I could be wrong though.
The package causing the issue was the HP printer drivers. Recently a newer version (v2.9) was released so I tried that and received no error messages.
thanks for posting the follow up, I ran into the same thing today with 2.8 HP drivers from Apple not compiling properly, and this saved me the time of trying to troubleshoot further. Good to go with 2.9.