无法安装php-mbstring

Question

我试图在一个已经安装了apache2、php和mariadb的Ubuntu18.04服务器上安装php。我尝试使用以下命令序列：

jonathan@samuel:~$ sudo apt update
[sudo] password for jonathan:
Hit:1 http://archive.ubuntu.com/ubuntu bionic InRelease
Hit:2 http://downloads.mariadb.com/MariaDB/mariadb-10.3/repo/ubuntu bionic InRelease
Get:3 http://archive.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB]
Ign:4 http://downloads.mariadb.com/MaxScale/2.2/ubuntu bionic InRelease
Hit:5 http://downloads.mariadb.com/Tools/ubuntu bionic InRelease
Get:6 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Hit:7 http://downloads.mariadb.com/MaxScale/2.2/ubuntu bionic Release
Fetched 172 kB in 2s (91.6 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
jonathan@samuel:~$ sudo apt install php-mbstring
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 php-mbstring : Depends: php7.2-mbstring but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
jonathan@samuel:~$ sudo apt -f install php7.2-mbstring
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 php7.2-mbstring : Depends: php7.2-common (= 7.2.3-1ubuntu1) but 7.2.7-0ubuntu0.18.04.2 is to be installed
E: Unable to correct problems, you have held broken packages.

似乎存在一个无法解决的依赖关系。我怎样才能纠正这种情况？这个问题阻碍了我安装phpMyAdmin的尝试。

Answer 1

我不得不在我的sources.list

中启用宇宙

sudo vi /etc/apt/sources.list

将文件改为如下所示：

deb http://archive.ubuntu.com/ubuntu bionic main universe
deb http://archive.ubuntu.com/ubuntu bionic-security main universe
deb http://archive.ubuntu.com/ubuntu bionic-updates main universe

更新了apt-get

sudo apt update

然后我可以安装php7.2-mbstring

Answer 2

在Ubuntu18.04#编辑文件/etc/apt/ same中，我也遇到了同样的问题。

deb http://archive.ubuntu.com/ubuntu bionic main multiverse restricted universe
deb http://archive.ubuntu.com/ubuntu bionic-security main multiverse restricted universe
deb http://archive.ubuntu.com/ubuntu bionic-updates main multiverse restricted universe

#PHP7.2 ->保存并运行：

sudo apt update && sudo apt-get upgrade
sudo apt-get install php7.2-mbstring

#PHP7.3 ->保存并运行：

sudo apt update && sudo apt-get upgrade
sudo apt-get install php7.3-mbstring

一切都结束了

Answer 3

只需使用：

sudo apt-get install php-mbstring

然后必须重新启动Apache服务，请使用：

sudo service apache2 restart