* Merge from Debian unstable, remaining changes: - lsb-base-logging-ubuntu.sh: change log_{success,warning,failure}_msg() to use usplash_write "TEXT" instead of "STATUS" to avoid unreadable line-wrapping when using usplash in verbose mode. - Don't conflict with python (>= 2.6). - Depend on postfix rather than exim4 as preferred mail-transport-agent alternative. - Depend on libgl1-mesa-glx rather than libgl1-mesa as preferred libgl1 alternative. - Since /etc/lsb-release overrides detected information, there's no need to try and detect that information if lsb-release contains everything we need. This saves us calling the hugely expensive apt-cache. - Add Ubuntu logging functions.