无法将PHP升级到7.3，因为没有可用的匹配程序包

我无法从ubuntu 16.04上的7.2升级到php7.3，我运行以下命令：

sudo apt-get install python-software-properties
sudo LC_ALL=C.UTF-8 add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt install php7.3

显示以下输出：

Building dependency tree       
Reading state information... Done
Note, selecting 'php7.3-mongodb' for regex 'php7.3'
Note, selecting 'php7.3-memcached' for regex 'php7.3'
Note, selecting 'php7.3-msgpack' for regex 'php7.3'
Note, selecting 'php7.3-igbinary' for regex 'php7.3'
Note, selecting 'php7.3-uploadprogress' for regex 'php7.3'
Note, selecting 'php-uploadprogress' instead of 'php7.3-uploadprogress'
php7.3-msgpack is already the newest version (2.1.1+0.5.7-2+ubuntu16.04.1+deb.sury.org+4).
php7.3-mongodb is already the newest version (1.8.1-2+ubuntu16.04.1+deb.sury.org+4).
php7.3-memcached is already the newest version (3.1.5+2.2.0-4+ubuntu16.04.1+deb.sury.org+4).
php-uploadprogress is already the newest version (1.0.3.1-4-g95d8a0f-5+ubuntu16.04.1+deb.sury.org+10).
php7.3-igbinary is already the newest version (3.1.6+2.0.8-2+ubuntu16.04.1+deb.sury.org+4).
0 upgraded, 0 newly installed, 0 to remove and 10 not upgraded.

和PHP-v仍然是旧版本

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解决方案

第二个řEJ前几天才removed support for 16.04：

到目前为止，Ubuntu 16.04 LTS(Xenial)的所有包都已从存储库中删除。

这解释了为什么它上周对您很有效，但今天不起作用。