I know Guitar pro doesn't support 64 bit, but i did get it to work with this command

jeggy@jeggy-XPS:~$ sudo dpkg --force-architecture -i GuitarPro6-rev9063.deb
[sudo] password for jeggy: 
Selecting previously unselected package guitarpro6:i386.
(Reading database ... 285729 files and directories currently installed.)
Unpacking guitarpro6:i386 (from GuitarPro6-rev9063.deb) ...
dpkg: dependency problems prevent configuration of guitarpro6:i386:
 guitarpro6:i386 depends on gksu.
dpkg: error processing guitarpro6:i386 (--install):
 dependency problems - leaving unconfigured
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf.index...
Processing triggers for desktop-file-utils ...
Processing triggers for gnome-menus ...
Errors were encountered while processing:
 guitarpro6:i386

And even after i get that error the program perfectly works fine and updating and adding PPA's to the system works great, but when I'm trying to install some other software i get this error:

jeggy@jeggy-XPS:~$ sudo apt-get install elinks
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 elinks : Depends: libfsplib0 (>= 0.9) but it is not going to be installed
          Depends: liblua50 (>= 5.0.3) but it is not going to be installed
          Depends: liblualib50 (>= 5.0.3) but it is not going to be installed
          Depends: libtre5 but it is not going to be installed
          Depends: elinks-data (= 0.12~pre5-7ubuntu1) but it is not going to be installed
 guitarpro6:i386 : Depends: gksu:i386 but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

And whenever i write "apt-get -f install" i get this

jeggy@jeggy-XPS:~$ sudo apt-get -f install
[sudo] password for jeggy: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  dconf-gsettings-backend:i386 python-levenshtein python-indicate libav-tools libstartup-notification0:i386
  libxmuu1:i386 libavfilter-extra-2 libbabl-0.0-0 libgegl-0.0-0 libgconf2-4:i386 python-vobject libgtk-3-0:i386
  libpam-cap:i386 python-utidylib libdconf0:i386 python-iniparse python-xmpp libpam-gnome-keyring:i386
  libxcb-util0:i386 python-farstream
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  guitarpro6:i386
0 upgraded, 0 newly installed, 1 to remove and 7 not upgraded.
1 not fully installed or removed.
After this operation, 84,0 MB disk space will be freed.
Do you want to continue [Y/n]? y
(Reading database ... 286979 files and directories currently installed.)
Removing guitarpro6:i386 ...
dpkg: warning: while removing guitarpro6:i386, directory '/opt/GuitarPro6/updater' not empty so not removed.
dpkg: warning: while removing guitarpro6:i386, directory '/opt/GuitarPro6/Data/Soundbanks' not empty so not removed.
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf.index...
Processing triggers for desktop-file-utils ...
Processing triggers for gnome-menus ...

And now Guitar Pro is deleted.
How can i install Guitar Pro and still be able to install other software afterwards?