10.7. My client completes the autoinstall process successfully, but I get an "Invalid Partition Table" error upon reboot, and Linux never boots.

SystemImager 2.0.x and earlier didn't maintain the bootable flag in the partition table. This worked fine in most cases, but in some cases this leads to an unbootable system. To confirm that this is the problem, boot your system from rescue media, and set the bootable flag on your boot partition using cfdisk or another partitioning tool. If this allows your system to boot, then you must upgrade SystemImager and regenerate your autoinstallscript(s). If for some reason you can't upgrade, then check the following: