grick23's workaround also seems to 'fix' this for a PowerEdge R805. Previously, this machine also had trouble with MAAS auto-detecting the IPMI settings with 14.04. So, it looks like many Dell 10th generation (10G) and older machines will run into problems based on the type of DRAC / BMC installed in them. As was stated in comment #33, the more modern 11G and 12G systems have no issues with the IPMI auto-detection.
grick23's workaround also seems to 'fix' this for a PowerEdge R805. Previously, this machine also had trouble with MAAS auto-detecting the IPMI settings with 14.04. So, it looks like many Dell 10th generation (10G) and older machines will run into problems based on the type of DRAC / BMC installed in them. As was stated in comment #33, the more modern 11G and 12G systems have no issues with the IPMI auto-detection.