我的mysql安装有问题，我无法单独解决。首先，我尝试使用此命令删除和清除旧文件
sudo apt-get remove --purge mysql
也试过了
sudo apt-get remove --purge mysql*
和
sudo apt-get remove --purge mariadb*
所有3条命令返回相同的输出...
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
dbconfig-mysql : Depends: mysql-client but it is not going to be installed or
mariadb-client but it is not going to be installed or
virtual-mysql-client
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
所以我运行了建议我的东西apt-get -f install，我已经
$ sudo apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following additional packages will be installed:
mysql-server-5.7
Suggested packages:
mailx tinyca
The following NEW packages will be installed:
mysql-server-5.7
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0 B/2,597 kB of archives.
After this operation, 48.3 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Preconfiguring packages ...
(Reading database ... 300885 files and directories currently installed.)
Preparing to unpack .../mysql-server-5.7_5.7.16-0ubuntu0.16.04.1_amd64.deb ...
Aborting downgrade from (at least) 10.0 to 5.7.
If are sure you want to downgrade to 5.7, remove the file
/var/lib/mysql/debian-*.flag and try installing again.
dpkg: error processing archive /var/cache/apt/archives/mysql-server-5.7_5.7.16-0ubuntu0.16.04.1_amd64.deb (--unpack):
subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing:
/var/cache/apt/archives/mysql-server-5.7_5.7.16-0ubuntu0.16.04.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
运行时得到的输出相同apt upgrade -f。这是输出systemctl status mysql.service -l
$ systemctl status mysql.service -l
● mysql.service
Loaded: not-found (Reason: No such file or directory)
Active: failed (Result: exit-code) since Wed 2016-11-23 07:32:55 EET; 58min ago
Nov 23 07:32:24 stan systemd[1]: Starting LSB: Start and stop the mysql database server daemon...
Nov 23 07:32:24 stan mysql[7818]: * Starting MariaDB database server mysqld
Nov 23 07:32:55 stan mysql[7818]: ...fail!
Nov 23 07:32:55 stan systemd[1]: mysql.service: Control process exited, code=exited status=1
Nov 23 07:32:55 stan systemd[1]: Failed to start LSB: Start and stop the mysql database server daemon.
Nov 23 07:32:55 stan systemd[1]: mysql.service: Unit entered failed state.
Nov 23 07:32:55 stan systemd[1]: mysql.service: Failed with result 'exit-code'.
我尝试过的另一件事是删除mysql-server然后再次安装它，仍然是同样的错误。
任何人都可以帮助解决这个问题。.我不知道如何解决它。
更新输出 lsb_release -a
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.1 LTS
Release: 16.04
Codename: xenial
Update2：输出 sudo apt install mysql-server mysql-client
$ sudo apt install mysql-server mysql-client
Reading package lists... Done
Building dependency tree
Reading state information... Done
mysql-client is already the newest version (5.7.16-0ubuntu0.16.04.1).
mysql-server is already the newest version (5.7.16-0ubuntu0.16.04.1).
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
mysql-server : Depends: mysql-server-5.7 but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: mysql-server : Depends: mysql-server-5.7 but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).