Comment 3 for bug 1456479

Thanks for the report! Unfortunately reporting it against apt is incorrect as apt itself contains no program which "automatically" adds PPAs or similar such. It just takes the sources.list content and interprets it. So it was either you adding this PPA by hand in which case its a user error (copy&paste maybe?) OR it was a tool (potentially in the apt-* namespace, but not maintained by the apt team) which has this bug.

Its a bit unlikely perhaps, but as far as apt is concerned main" could be a valid component (also, because it is hardly defined which characters could be) and the error messages it prints tell you that it tried to get data for the main" component as it was configured to do, but wasn't able to.