1. 刪除mysql
a. sudo apt-get autoremove --purge mysql-server-5.0
b. sudo apt-get remove mysql-server
c. sudo apt-get autoremove mysql-server
d. sudo apt-get remove mysql-common (非常重要)
2. 清理殘留數據
dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P
如果報如下錯誤，證明你的系統中沒有殘留配置文件了，無須擔心。
dpkg: --purge needs at least one package name argument
Type dpkg --help for help about installing and deinstalling packages [*];
Use `dselect' or `aptitude' for user-friendly package management;
Type dpkg -Dhelp for a list of dpkg debug flag values;
Type dpkg --force-help for a list of forcing options;
Type dpkg-deb --help for help about manipulating *.deb files;
Type dpkg --license for copyright license and lack of warranty (GNU GPL) [*].
Options marked [*] produce a lot of output - pipe it through `less' or `more' !
下面安裝mysql5.6
你必須先刪除這些文件夾：/etc/mysql/ /var/lib/mysql /var/log/mysql/var/lib/mysql-filters /var/lib/mysql-keyring和這個文件：/var/lib/mysql/debian-5.7.flag - T0m3kk 7月22日在12:41
1. sudo apt-get install software-properties-common
2. $ sudo add-apt-repository -y ppa:ondrej/mysql-5.6
3. $ sudo apt-get update
4. $ sudo apt-get install mysql-server-5.6