full output from command follows:
==========================
% sudo add-apt-repository ppa:xorg-edgers/ppa
[sudo] password for matt:
/usr/lib/python2.6/dist-packages/softwareproperties/SoftwareProperties.py:114: DeprecationWarning: Attribute 'FindI' of the 'apt_pkg.Configuration' object is deprecated, use 'find_i' instead.
value = apt_pkg.Config.FindI(softwareproperties.CONF_MAP[option])
/usr/lib/python2.6/dist-packages/softwareproperties/ppa.py:43: DeprecationWarning: Attribute 'FindDir' of the 'apt_pkg.Configuration' object is deprecated, use 'find_dir' instead.
sourceslistd = apt_pkg.Config.FindDir("Dir::Etc::sourceparts")
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv 165D673674A995B3E64BF0CF4F191A5A8844C542
gpg: requesting key 8844C542 from hkp server keyserver.ubuntu.com
gpg: key 8844C542: public key "Launchpad PPA for xorg crack pushers" imported
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: python-software-properties 0.75.10
ProcVersionSignature: Ubuntu 2.6.35-2.3-generic 2.6.35-rc2
Uname: Linux 2.6.35-2-generic x86_64
Architecture: amd64
Date: Mon Jun 14 22:58:30 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
PackageArchitecture: all
ProcEnviron:
PATH=(custom, user)
LANG=en_GB.utf8
SHELL=/bin/zsh
SourcePackage: software-properties
This appears to be the same as bug 593484, with practically identical fixes proposed. The only difference is this bug (and its fix) is against the Ubuntu package, whereas 593484 (and its fix) is against upstream.