无法使用 apt-get 安装 PHP 包,提示“E:无法定位包” [英]Unable to install PHP packages with apt-get, gives "E: Unable to locate package"
E:安装Virtuoso时找不到软件包virtuoso-vad-cartridges [英]E: Unable to locate package virtuoso-vad-cartridges while installing Virtuoso
E:无法在 Ubuntu 16.04 上找到 package ros-kinetic-desktop-full [英]E: Unable to locate package ros-kinetic-desktop-full on Ubuntu 16.04