我尝试输入以下命令
add-apt-repository ppa:ondrej/php5
You are about to add the following PPA to your system:
This branch follows latest PHP packages as maintained by me & rest of the Debian pkg-php team.
You can get more information about the packages at https://sury.org
If you need to stay with PHP 5.4 you can use the oldstable PHP repository:
    ppa:ondrej/php5-oldstable
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gpg: keyring `/tmp/tmpy7ajyf/secring.gpg' created
gpg: keyring `/tmp/tmpy7ajyf/pubring.gpg' created
gpg: requesting key E5267A6C from hkp server keyserver.ubuntu.com
gpg: /tmp/tmpy7ajyf/trustdb.gpg: …