Debian升级到10版本后，请我自动删除几个软件包。 所以我说“是”，现在一切都不好了。
这是我尝试安装mysql服务器时看到的内容：
apt-get install mysql-server
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:
mysql-server : Depends: default-mysql-server but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
这是我尝试安装default-mysql-server的时间：
apt-get install default-mysql-server
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:
default-mysql-server : Depends: mariadb-server-10.1 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
这是尝试安装mariadb-server-10.1的时候
apt-get install mariadb-server-10.1
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:
mariadb-server-10.1 : Depends: libdbi-perl but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
这是我尝试安装libdbi-perl的时间
apt-get install libdbi-perl
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:
libdbi-perl : Depends: perlapi-5.24.1
E: Unable to correct problems, you have held broken packages.
这是当我尝试安装perlapi-5.24.1
apt-get install perlapi-5.24.1
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package perlapi-5.24.1 is a virtual package provided by:
perl-base 5.24.1-3+deb9u5 [Not candidate version]
E: Package 'perlapi-5.24.1' has no installation candidate