我目前正在努力解决一些 mysql 问题。
我现在有一段时间不能使用 apt-get 了，因为它总是卡在那一行Setting up mysql-server-5.6 (5.6.27-0ubuntu0.15.04.1) ...，不让我做任何事情。所以我试着重新安装 mysql，清除它。虽然我能够删除，mysql-server但mysql-client最终还是无法清除mysql-common。显然，我设法破坏了一些东西，但此时我该如何让我的系统恢复运行呢？
...:~# apt-get purge mysql-common
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
mysql-common*
0 upgraded, 0 newly installed, 1 to remove and 5 not upgraded.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] Y
(Reading database ... 423600 files and directories currently installed.)
Removing mysql-common (5.6.27-0ubuntu0.15.04.1) ...
Purging configuration files for mysql-common (5.6.27-0ubuntu0.15.04.1) ...
update-alternatives: error: /var/lib/dpkg/alternatives/my.cnf corrupt: invalid status
dpkg: error processing package mysql-common (--purge):
subprocess installed post-removal script returned error exit status 2
Errors were encountered while processing:
mysql-common
E: Sub-process /usr/bin/dpkg returned an error code (1)
-
...# sudo dpkg -P --force-all mysql-common
(Reading database ... 424733 files and directories currently installed.)
Removing mysql-common (5.6.27-0ubuntu0.15.04.1) ...
Purging configuration files for mysql-common (5.6.27-0ubuntu0.15.04.1) ...
update-alternatives: error: no alternatives for my.cnf
dpkg: error processing package mysql-common (--purge):
subprocess installed post-removal script returned error exit status 2
Errors were encountered while processing:
mysql-common
-
...:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.04
Release: 15.04
Codename: vivid
我的目标是让它恢复并再次运行（mysql）。
答案1
在说了几句话之后聊天，解决方案如下：
sudo rm /etc/alternatives/my.cnf
sudo ln -s /etc/mysql/mysql.cnf /etc/alternatives/my.cnf
为什么？文件/etc/alternatives/my.cnf 必须一个链接，没有其他内容。
这是错误信息：
$ sudo update-alternatives --config my.cnf
update-alternatives: warning: alternative /etc/mysql/mysql.cnf (part of link group my.cnf) doesn't exist; removing from list of alternatives
update-alternatives: error: unable to read link `/etc/alternatives/my.cnf': Invalid argument