Can'；t在ubuntu 16.10上再次安装php5.6-curl。加入ppa。

我正在尝试安装php5.6-curl包。它以前安装过，但我做了一些手工构建curl的工作，所以我从系统中删除了php5.6-curl包。在这次操作之后，我还运行了apt autoremove

所以，在成功构建之后，我尝试调用apt get install php5.6-curl，它向我展示了这一点

dirst@dirst-machine:~$ sudo apt-get install php5.6-curl
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package php5.6-curl 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 'php5.6-curl' has no installation candidate

您可以确定，我的ubuntu上安装了ppa:ondrej/php5-5.6，因为系统中有php5.6，而且php5.6-curl包以前也安装过

我还尝试再次添加ppa并运行apt get update。我不知道这些信息的意思

http://ppa.launchpad.net/ondrej/php/ubuntu yakkety InRelease
.....
   Fetched 107 kB in 3s (31.9 kB/s)
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/shutter/ppa/ubuntu yakkety Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: https://repo.skype.com/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1F3045A5DF7587C3
W: The repository 'https://repo.skype.com/deb stable InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: https://linuxdesktopcloud.mail.ru/screenshoter/deb/dists/appind/InRelease: Signature by key 8A99BA500079839DF7DE4833196205AF7396FF77 uses weak digest algorithm (SHA1)
E: Failed to fetch http://ppa.launchpad.net/shutter/ppa/ubuntu/dists/yakkety/main/binary-amd64/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

接下来，我尝试检查apt缓存搜索php5.6中可用的php扩展。没有php5.6-curl，但我知道它应该在那里

dirst@dirst-machine:~$ apt-cache search php5.6
php-igbinary - igbinary PHP serializer
php-msgpack - PHP extension for interfacing with MessagePack
php-ssh2 - Bindings for the libssh2 library
php-xdebug - Xdebug Module for PHP
php5.6-opcache - Zend OpCache module for PHP
php5.6-mysql - MySQL module for PHP
php5.6-json - JSON module for PHP
php5.6-common - documentation, examples and common module for PHP
php5.6 - server-side, HTML-embedded scripting language (metapackage)
php5.6-mcrypt - libmcrypt module for PHP
php5.6-readline - readline module for PHP
php5.6-gd - GD module for PHP
php5.6-xml - DOM, SimpleXML, WDDX, XML, and XSL module for PHP
php5.6-cli - command-line interpreter for the PHP scripting language
php5.6-mbstring - MBSTRING module for PHP
php5.6-ldap - LDAP module for PHP
libapache2-mod-php5.6 - server-side, HTML-embedded scripting language (Apache 2 module)
php-memcached - memcached extension module for PHP, uses libmemcached

我还在云中发布了clean ubuntu 16.04，并尝试执行相同的操作。 -安装php5.6，php5.6-curl。 -移除curl，然后手动构建它 -再次安装php5.6-curl

一切都很顺利。当我在云ubuntu上执行apt缓存搜索php5.6时，扩展列表太大了

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我不知道我做错了什么，我不是很强的linux的家伙，所以我不知道发生了什么。请帮忙。

阿斯库布图的人帮忙了。事情很明显。只要把ppa回购协议从yakkety改为xenial，它就行了。因为yakkety在回购协议中没有php5.6-curl