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参考：
redmine下载地址 http://www.redmine.org/releases/
搭建教程http://www.redmine.org/projects/redmine/wiki/HowTo_Install_Redmine_on_Ubuntu_step_by_step
http://www.redmine.org/projects/redmine/wiki/HowTo_Install_Redmine_25x_on_Ubuntu_1404_with_Apache2_Phusion_Passenger_MySQL_and_Subversion
https://blog.csdn.net/yuanyuan_186/article/details/51316637
https://www.redmine.org/issues/28190
遇到问题1：
Could not reliably determine the server’s fully qualified domain name, using 127.0.1.1
利用
https://blog.csdn.net/yuanyuan_186/article/details/51316637
解决
httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
解决办法非常简单：
root@raspberrypi:/etc/apache2# vi apache2.conf
# Include the virtual host configurations:
ServerName localhost:80
Include sites-enabled/
root@raspberrypi:/etc/apache2# service apache2 restart
[ ok ] Restarting web server: apache2 ... waiting ..遇到问题2：
Apache passenger stopped work after upgrade passenger from 5.1.12 to 5.20
passenger需要安装老版本的，利用
https://www.redmine.org/issues/28190
解决
I resolve this problem with downgrade passenger version.
1) Uninstall new version:
apt-get remove -y passenger libapache2-mod-passenger
2) Install specific version:
sudo apt-get install passenger=1:5.1.12-1~trusty1
sudo apt-get install libapache2-mod-passenger=1:5.1.12-1~trusty1
sudo apt-get install passenger-dev=1:5.1.12-1~trusty1
3) Enaple apache module:
sudo a2enmod passenger
4) Restart apache:
sudo service apache2 restart遇到问题3：
在配置数据库的时候，一定要保证用户名和密码是对的，我就配错了，导致坑了好久。