Transferred from: http://www.cnblogs.com/SunOne/p/6820145.html
Download flash:http://get.adobe.com/cn/flashplayer/from Adobe official website
The version I downloaded is: flash_player_npapi_linux.x86_64.tar.gz
Find the correct directory
sunone@hy-chess:~$ Whereis Firefox
Firefox:/usr/bin/firefox
sunone@hy-chess:~$ find/usr/-name Firefox
/usr/bin/firefox
Find: '/usr/lost+found ': Permission denied
sunone@hy-chess:~$ find/usr/-name Mozilla
/usr/share/mozilla
/usr/share/ca-certificates/mozilla
Find: '/usr/lost+found ': Permission denied
/usr/lib/mozilla
See where plugins is going.
sunone@hy-chess:~$ ls/usr/share/mozilla/
Extensions
sunone@hy-chess:~$ ls/usr/lib/mozilla/
Extensions Plugins
Ok, find the plugin directory/usr/lib/mozilla/plugins
Unzip the downloaded plug-in installation package
sunone@hy-chess:~/downloads$ TAR-ZXVF flash_player_npapi_linux.x86_64.tar.gz
Locate the libflashplayer.so file and usr/This folder, copy libflashplayer.so to/usr/lib/mozilla/plugins
sunone@hy-chess:~/downloads$ sudo cp libflashplayer.so/usr/lib/mozilla/plugins/
Copy the usr/folder to/usr
sunone@hy-chess:~/downloads$ sudo cp-r usr/*/usr
Restart the browser, the plugin loaded successfully.