I had the same issue after upgrading my server from 16.10 to 17.04 and failed at the same spot twice. Researched and found that if I removed sysv-rc-conf from the config file located within the lib folder that is located in the installation files, fogproject-1.4.0-RC-9.x/lib/ubuntu/ which specifies which packages it needs to download, I’ve found it succeeds without issue for me. Maybe this only matters in regards to 17.04, not sure though.
Posts made by FoSTerCyber
RE: Upgrade Ubuntu 16.10 to 17.04 sysv-rc-conf fail
RE: Some laptops cannot get past "Starting Windows"
I have ran into this before. The problem was that some of the settings in the BIOS were not the same as when the image was initially pulled. My issue was that the SATA settings on one was set to RAID and the other laptop was either set to ATA or AHCI. Hope this helps you.