libphp7.3.so启动apache2时找不到

Question

当我跑步时

service apache2 start

我得到这个错误：

Job for apache2.service failed because the control process exited with error code.
See "systemctl status apache2.service" and "journalctl -xe" for details.

在浏览答案时，我发现了这个命令：

apache2ctl -M

运行时给了我这个错误：

apache2: Syntax error on line 146 of /etc/apache2/apache2.conf: Syntax error on line 3 of /etc/apache2/mods-enabled/php7.3.load: Cannot load /usr/lib/apache2/modules/libphp7.3.so into server: /usr/lib/apache2/modules/libphp7.3.so: cannot open shared object file: No such file or directory
Action '-M' failed.
The Apache error log may have more information.

我在网上找到的一个解决方案是运行

sudo apt install -y libapache2-mod-php7.3

但我得到了这个错误

Package libapache2-mod-php7.3 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 'libapache2-mod-php7.3' has no installation candidate

有人知道如何解决这个问题吗？