从 13.10 升级到 14.04 卡在 Debconf 中

Question

我正在将 ubuntu 13.10 升级到 14.04 LTS。

在升级过程中，会弹出一个窗口并显示一条消息，"what do you want to do about configuration file php.ini? " 然后我选择“启动一个新 shell 来检查情况”。按“前进”按钮。

此后升级过程看起来停止了。

如果我在终端中输入命令“sudo apt-get update”，它会返回

E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/lib/apt/lists/
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?