错误！以下软件包具有未满足的依赖关系：mysql-server

Question

我试图在我的ubuntu16.04上安装mysql以用于django项目。安装有一些问题，一些现有的文件，得到错误：

mysql-server is already the newest version (5.7.19-0ubuntu0.16.04.1). 
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) 

我试过了，sudo易于得到-f安装的提示错误：

Preparing to unpack .../mysql-server-5.7_5.7.19-0ubuntu0.16.04.1_amd64.deb ... 
grep: /etc/mysql/: No such file or directory 
Aborting downgrade from (at least) 10.2 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_5.7.19-0ubuntu0.16.04.1_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_5.7.19-0ubuntu0.16.04.1_amd64.deb 
E: Sub-process /usr/bin/dpkg returned an error code (1) 

我曾试图安装步骤也，但得到第一个错误。

Answer 1

与另一个软件包有类似的问题，并解决了我的问题。

sudo dpkg -i --force-overwrite /var/cache/apt/archives/libmysqlclient20_5.7.20-1ubuntu16.04_amd64.deb