Using the -d flag will not upgrade you to Edgy it will upgrade you to feisty. and if going from dapper to feisty expect major issues. Its not supported or proven to be safe to skip releases.
-- Update-manager cannot upgrade from Dapper to Edgy https://launchpad.net/bugs/80843 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
