Okay, now I (sort of) found out the problem: I had to specify the name of the .asc files that sign the packages. Now, however, I am getting a different error:
kenny_strawn@kenny-AOA110:~/ubuntu-releases$ dput -f *.asc ppa:mango-k/ubuntu-releases *.changes
No host ubuntu-release-dapper_6.06-0ubuntu1.dsc.asc found in config
I have packages that include sources.list files for ALL the supported releases, in order to allow one to upgrade or downgrade at will.
Any help is appreciated. Please try to reply, not just glance and leave.