参见图片。这是当前时间的显示方式——“13:39:22”和“2:57:31pm”中的“3”不见了……有什么办法可以解决这个问题吗？
（它似乎是在昨天上次升级后开始的。）
时钟时间‘13:49:22’：
时钟时间：‘下午 2:57:31’：
正在使用的 apt 源列表（我猜可能需要清理一下）：
user@host:~$ grep ^ /etc/apt/sources.list /etc/apt/sources.list.d/* -h
deb http://de.archive.ubuntu.com/ubuntu/ quantal main restricted universe multiverse
deb http://de.archive.ubuntu.com/ubuntu/ quantal-updates main restricted universe multiverse
deb http://de.archive.ubuntu.com/ubuntu/ quantal-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu/ quantal-security main restricted universe multiverse
deb http://extras.ubuntu.com/ubuntu/ quantal main
deb http://dl.google.com/linux/talkplugin/deb/ stable main
deb http://dl.google.com/linux/talkplugin/deb/ stable main
deb http://dl.google.com/linux/talkplugin/deb/ stable main
deb http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu quantal main
deb-src http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu quantal main
deb http://archive.canonical.com/ubuntu quantal partner #Added by software-center
deb http://archive.canonical.com/ubuntu precise partner #Added by software-center
deb http://archive.canonical.com/ubuntu quantal partner #Added by software-center
deb http://ppa.launchpad.net/scopes-packagers/ppa/ubuntu precise main
deb http://ppa.launchpad.net/stebbins/handbrake-releases/ubuntu quantal main
deb-src http://ppa.launchpad.net/stebbins/handbrake-releases/ubuntu quantal main
deb http://ppa.launchpad.net/stebbins/handbrake-releases/ubuntu quantal main
deb-src http://ppa.launchpad.net/stebbins/handbrake-releases/ubuntu quantal main