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[Ubuntu] XAMPP: Couldn't start MySQL!

After i downloaded the lampp and unpacked it in /opt/lampp, then i try to run it, 

sudo / opt / lampp / lampp start

I got these message:

Starting XAMPP for Linux 1.7 .3a...
XAMPP: Starting Apache with SSL (and PHP5)...
XAMPP: Starting MySQL...
XAMPP: Couldn't start MySQL
!
XAMPP: Starting ProFTPD...
XAMPP
for Linux started.

MySQL can't start!

Then i check the log in /opt/lampp/var/mysql/

程式碼 101117 23 : 54 : 57 mysqld_safe Starting mysqld daemon with databases from / opt / lampp / var / mysql
101117 23 : 54 : 57 [Note] Plugin 'FEDERATED' is disabled.
101117 23 : 54 : 57 [ERROR] Can't open shared library 'libpbxt.so' (errno:
0 API version for STORAGE ENGINE plugin is too different)
101117 23 : 54 : 57 [Warning] Couldn't load plugin named 'PBXT' with soname 'libpbxt.so'.
101117 23 : 54 : 57 InnoDB: Started; log sequence number 0 44233 101117 23 : 54 : 57 [ERROR] Can't start server : Bind on unix socket: Permission denied
101117 23 : 54 : 57 [ERROR] Do you already have another mysqld server running on socket: / opt / lampp / var / mysql / mysql.sock ? 101117 23 : 54 : 57 [ERROR] Aborting

101117 23 : 54 : 57 InnoDB: Starting shutdown...
101117 23 : 54 : 58 InnoDB: Shutdown completed; log sequence number 0 44233 101117 23 : 54 : 58 [Note] / opt / lampp / sbin / mysqld: Shutdown complete

101117 23 : 54 : 58 mysqld_safe mysqld from pid file / opt / lampp / var / mysql / davidhhuan - ThinkPad - T410.pid ended

Searching it in google, it seems that mysql does not have the permission to do something.

There are two way to achieve it.

One:

sudo chown mysql.mysql - R / opt / lampp / var / mysql

Two:

sudo chmod 777 / opt / lampp / var / mysql - R

I followed the second way, then MySQL can run well!