mysql - 无法在 Ubuntu 16.04 上安装 MySQL 5.7

Question

在我的 Ubuntu 16.04 Digital Ocean Droplet（安装了他们的 LAMP 堆栈）上运行更新和安装后，我无法安装 MySQL ......我在这里尝试了很多帖子，但似乎没有一个工作和结果对我来说总是一样的：

Setting up mysql-server-5.7 (5.7.22-0ubuntu0.16.04.1) ...
update-alternatives: error: alternative link /etc/mysql/my.cnf is already managed by my.cnf.bak
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 2
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-5.7; however:
  Package mysql-server-5.7 is not configured yet.

dpkg: error processing package mysql-server (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          Errors were encountered while processing:
 mysql-server-5.7
 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)

我怀疑是“update-alternatives”行导致了这个问题，但我的系统上没有 my.cnf.bak。我不是服务员，所以任何帮助都会很棒！

尝试通过 Aptitude 安装时的结果：

The following partially installed packages will be configured:
  mysql-server mysql-server-5.7
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.
Setting up mysql-server-5.7 (5.7.22-0ubuntu0.16.04.1) ...
update-alternatives: error: alternative link /etc/mysql/my.cnf is already managed by my.cnf.bak
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 2
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-5.7; however:
  Package mysql-server-5.7 is not configured yet.

dpkg: error processing package mysql-server (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          Errors were encountered while processing:
 mysql-server-5.7
 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)
Failed to perform requested operation on package.  Trying to recover:
Setting up mysql-server-5.7 (5.7.22-0ubuntu0.16.04.1) ...
update-alternatives: error: alternative link /etc/mysql/my.cnf is already managed by my.cnf.bak
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 2
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-5.7; however:
  Package mysql-server-5.7 is not configured yet.

dpkg: error processing package mysql-server (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 mysql-server-5.7
 mysql-server

标签： mysqlapacheubuntu-16.04digital-oceandpkg