Completely Remove Kubuntu Desktop From Ubuntu 14.04?

Question

I installed "Kubuntu Plasma Desktop/Netbook system" from the ubuntu software system to try it out. I prefer Unity and want to remove Kubuntu.

I uninstalled from the Ubuntu software center, but it hasn't worked. During boot I get "Kubuntu" on the screen and not "Ubuntu", also I can log in into Kubuntu and it is working fine.

So how can I remove Kubuntu and all files that came with it?

When trying sudo apt-get autoremove kubuntu-desktop I get this message: Package 'kubuntu-desktop' is not installed, so not removed

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Here is my terminal output after trying the commands sudo apt-get install aptitude and sudo aptitude remove '?and(?depends(?exact-name(kubuntu-desktop)),?not(?depends(?exact-name(ubuntu-desktop))))':

darren@darren-K52Jr:~$ sudo apt-get install aptitude
[sudo] password for darren: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
aptitude is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 18 not upgraded.
darren@darren-K52Jr:~$ sudo aptitude remove '?and(?depends(?exact-name(kubuntu-desktop)),?not(?depends(?exact-name(ubuntu-desktop))))'
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 18 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.

darren@darren-K52Jr:~$

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Using sudo apt-get --purge remove kubuntu-desktop, sudo apt-get autoremove and run sudo apt-get autoclean I get these result:

darren@darren-K52Jr:~$ sudo apt-get --purge remove kubuntu-desktop
[sudo] password for darren: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package 'kubuntu-desktop' is not installed, so not removed
0 upgraded, 0 newly installed, 0 to remove and 18 not upgraded.
darren@darren-K52Jr:~$ ^C
darren@darren-K52Jr:~$ sudo apt-get autoremove
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 18 not upgraded.
darren@darren-K52Jr:~$ sudo apt-get autoclean
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Del python-imaging 1.1.7+2.0.0-1ubuntu1.1 [347 kB]
Del python-imaging-compat 1.1.7+2.0.0-1ubuntu1.1 [5,410 B]
Del libwhoopsie0 0.2.24.1.2 [7,350 B]
Del ubuntu-tweak 0.8.7-0~bzr1993+20140421~ubuntu13.10.1 [994 kB]
Del python3-distupgrade 1:0.205.6 [136 kB]
Del numix-icon-theme 0.3+139~201404162022~ubuntu13.10.1 [3,431 kB]
Del unity 7.2.0+14.04.20140423-0ubuntu1.1 [1,437 kB]
Del unity-services 7.2.0+14.04.20140423-0ubuntu1.1 [29.3 kB]
Del whoopsie 0.2.24.1.2 [26.6 kB]
Del libcurl3 7.32.0-1ubuntu1.4 [198 kB]
Del ubuntu-release-upgrader-core 1:0.205.6 [24.1 kB]
Del flashplugin-installer 11.2.202.350ubuntu0.13.10.1 [6,932 B]
Del libunity-core-6.0-9 7.2.0+14.04.20140423-0ubuntu1.1 [447 kB]
Del numix-gtk-theme 2.2+294~201404131947~ubuntu13.10.1 [41.5 kB]
Del libcurl3-gnutls 7.32.0-1ubuntu1.4 [189 kB]
Del libsnmp30 5.7.2~dfsg-8ubuntu1.1 [1,322 kB]
Del libsnmp-base 5.7.2~dfsg-8ubuntu1.1 [235 kB]
Del ubuntu-release-upgrader-gtk 1:0.205.6 [10.5 kB]
darren@darren-K52Jr:~$ 

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Results for command sudo aptitude search '?depends(?exact-name(kubuntu-desktop)':

darren@darren-K52Jr:~$ sudo aptitude search '?depends(?exact-name(kubuntu-desktop)'
[sudo] password for darren: 
E: Match pattern ends unexpectedly (expected ')').
darren@darren-K52Jr:~$