Installing a profile inherited from an existing distribution
Are you adding those dependencies to your .info file mydistro.info?

If not, you should. It looks like the install is getting to line 196 in the standard.install file and then trying to enable all those blocks, but the blocks module was never enabled and it doesn't test for that, which is breaking the install. @VanD

Basically you should add the same modules listed as dependencies in the standard profile, also to mydistro.info and re-run the installation.