Довольно странно. Я посмотрел, у меня счастливо сожительствуют ubuntuone-control-panel-qt и python-2.7.4. У вас почему то требует не ниже 2.8.
И
xdebug, php-pear, php5-dev я попробовал отметить в Muon -- он ни одной ошибки не выкинул. Возможно у вас что-то с источниками, попробуйте ради эксперимента забэкапить
/etc/apt/sources.list и заменить его моим.
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://ubuntu.mirror.cambrium.nl/ubuntu/ raring main restricted
deb-src http://ubuntu.mirror.cambrium.nl/ubuntu/ raring main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://ubuntu.mirror.cambrium.nl/ubuntu/ raring-updates main restricted
deb-src http://ubuntu.mirror.cambrium.nl/ubuntu/ raring-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
# deb http://ubuntu.mirror.cambrium.nl/ubuntu/ raring universe
# deb-src http://ubuntu.mirror.cambrium.nl/ubuntu/ raring universe
# deb http://ubuntu.mirror.cambrium.nl/ubuntu/ raring-updates universe
# deb-src http://ubuntu.mirror.cambrium.nl/ubuntu/ raring-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://ubuntu.mirror.cambrium.nl/ubuntu/ raring multiverse
deb-src http://ubuntu.mirror.cambrium.nl/ubuntu/ raring multiverse
deb http://ubuntu.mirror.cambrium.nl/ubuntu/ raring-updates multiverse
deb-src http://ubuntu.mirror.cambrium.nl/ubuntu/ raring-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://ubuntu.mirror.cambrium.nl/ubuntu/ raring-backports main restricted universe multiverse
deb-src http://ubuntu.mirror.cambrium.nl/ubuntu/ raring-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu raring-security main restricted
deb-src http://security.ubuntu.com/ubuntu raring-security main restricted
deb http://security.ubuntu.com/ubuntu raring-security universe
deb-src http://security.ubuntu.com/ubuntu raring-security universe
deb http://security.ubuntu.com/ubuntu raring-security multiverse
deb-src http://security.ubuntu.com/ubuntu raring-security multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu raring partner
deb-src http://archive.canonical.com/ubuntu raring partner
## Uncomment the following two lines to add software from Ubuntu's
## 'extras' repository.
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu raring main
deb-src http://extras.ubuntu.com/ubuntu raring main
deb http://packages.bodhilinux.com/bodhi precise stable
deb http://getdeb.bodhilinux.com/getdeb precise-getdeb apps games
deb http://archive.ubuntu.com/ubuntu quantal main universe multiverse restricted
deb-src http://archive.ubuntu.com/ubuntu quantal main universe multiverse restricted #Added by software-properties
deb http://repo.mate-desktop.org/ubuntu raring main
deb-src http://repo.mate-desktop.org/ubuntu raring main
sudo apt-get update
sudo apt-get upgradeUPD: да, правда у меня
raring, не
quantal, но надо же когда-то обновляться

Можете поменять все надписи
raring на
quantal; но если проблема останется, я не имею других идей, кроме как делать обновление до
raring. У меня, к слову формально тоже 12.04, я обновил все пакеты через apt-get dist-upgrade. Просто, когда я пытался (два раза!) обновиться через
sudo do-release-upgrade, то чуть не поломал систему. Мб только у меня так вышло, но больше пробовать не хочу: источники я заменил, а больше и не надо.