ubuntu – 如果包没有安装候选人,我该怎么办？

我正在尝试安装PHP5-sqlite3.在命令行中输入：

sudo apt-get install PHP5-sqlite3

结果我得到：

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package PHP5-sqlite3 is not available,but is referred to by another package.
This may mean that the package is missing,has been obsoleted,or
is only available from another source
E: Package PHP5-sqlite3 has no installation candidate

这里发生了什么以及如何解决这个问题？

我想你想要PHP5-sqlite.