How do I unlock a file ?

[SYNass IT Ubuntu / Linux]

Hi, after a recent discussion about MythTV here 
I tried to install it and decided not to use now and 
uninstalled again !

I noticed that MythTV also installed a directory under /home 
and wanted to remove it too !!

Got to learn that it's not empty and found this:
 
sna at WS222:~$ cd /home
sna at WS222:/home$ ls
mythtv  sna
sna at WS222:/home$ sudo rmdir mythtv
[sudo] password for sna:
rmdir: mythtv: Directory not empty
sna at WS222:/home$ cd mythtv
sna at WS222:/home/mythtv$ ls
sna at WS222:/home/mythtv$ ls -a
.  ..  .qt
sna at WS222:/home/mythtv$ cd /qt
bash: cd: /qt: No such file or directory
sna at WS222:/home/mythtv$ cd .qt
sna at WS222:/home/mythtv/.qt$ ls -a
.  ..  .qt_plugins_3.3rc.lock
sna at WS222:/home/mythtv/.qt$

How do I unlock this file to get the whole MythTV removed ???

TIA for your advice and assistance. ;-)
Cheers, svobi