我想在 Ubuntu 14.0.4 上为 PHP7 安装 phpize，所以我正在运行以下命令：
sudo apt-get install php7.0-dev
但我收到以下错误：
E: Failed to fetch http://ppa.launchpad.net/ondrej/php-7.0/ubuntu/pool/main/p/php7.0/php7.0-common_7.0.3-5+deb.sury.org~trusty+1_all.deb 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/ondrej/php-7.0/ubuntu/pool/main/p/php7.0/php7.0-cli_7.0.3-5+deb.sury.org~trusty+1_amd64.deb 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/ondrej/php-7.0/ubuntu/pool/main/p/php-pear/php-pear_1.10.1+submodules+notgz-3+deb.sury.org~trusty+3_all.deb 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/ondrej/php-7.0/ubuntu/pool/main/p/php7.0/php7.0-dev_7.0.3-5+deb.sury.org~trusty+1_amd64.deb 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/ondrej/php-7.0/ubuntu/pool/main/d/dh-php/dh-php_0.6+deb.sury.org~trusty+1_all.deb 404 Not Found
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
关于如何修复这些错误的任何想法？