尝试安装mysql，我总是收到以下错误：
处理时遇到错误： /var/cache/apt/archives/mysql-server-5.7_5.7.21-0ubuntu0.17.10.1_amd64.deb E：子进程/ usr / bin / dpkg返回错误代码（1）
完整见下文：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
mailx tinyca
The following NEW packages will be installed:
mysql-server-5.7
0 upgraded, 1 newly installed, 0 to remove and 6 not upgraded.
Need to get 0 B/3,184 kB of archives.
After this operation, 48.3 MB of additional disk space will be used.
Preconfiguring packages ...
(Reading database ... 283762 files and directories currently installed.)
Preparing to unpack .../mysql-server-5.7_5.7.21-0ubuntu0.17.10.1_amd64.deb ...
Failed to stop mysql.service: Unit mysql.service not loaded.
invoke-rc.d: initscript mysql, action "stop" failed.
invoke-rc.d returned 5
There is a MySQL server running, but we failed in our attempts to stop it.
Stop it yourself and try again!
dpkg: error processing archive /var/cache/apt/archives/mysql-server-5.7_5.7.21-0ubuntu0.17.10.1_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_5.7.21-0ubuntu0.17.10.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
I have tried this solution
以及stackoverflow上几乎所有可用的解决方案，但它并没有解决我的问题
即使是sudo apt-get remove --purge mysql-server也没有完全删除mysql服务器。我已经使用synaptic manager