When I tried dropping into a shell at various points during the install, those commands did not work at any point. I imagine it has to be in there _SOMEWHERE_ so as to allow actual partitioning, but I wouldn't be surprised if they're only loaded into memory after the last point where it's possible to drop into a shell before the partitioning phase of the setup, and before the partitioning phase. I found this to be the case after burning both the 14.04 LTS and 14.04.1 LTS discs.
When I tried dropping into a shell at various points during the install, those commands did not work at any point. I imagine it has to be in there _SOMEWHERE_ so as to allow actual partitioning, but I wouldn't be surprised if they're only loaded into memory after the last point where it's possible to drop into a shell before the partitioning phase of the setup, and before the partitioning phase. I found this to be the case after burning both the 14.04 LTS and 14.04.1 LTS discs.