how can i fix this vlc problem [duplicate]

According to your issue you had to disable unstable ppa/repos as instructed here

Then open a terminal and run:

sudo apt-get remove --purge vlc-nox
sudo apt-get autoclean
sudo dpkg --configure -a
sudo apt-get -f install
sudo apt-get autoremove
sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get install vlc

If you want to use more fresh version of VLC media player rather than in official Ubuntu repos, you can use Videolan official stable-daily PPA:

sudo add-apt-repository ppa:videolan/stable-daily
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install vlc

Addition:

Just for the others who face an issue upgrading vlc to 2.2.0 on 14.04LTS even occured to me with ppa:videolan/stable-daily it still had 2.1.6 version installed. To upgrade it to 2.2.0 version add this trusty-media PPA:

sudo add-apt-repository ppa:mc3man/trusty-media
sudo apt-get update
sudo apt-get install --reinstall vlc

P.S.

Do remember this ppa contains also other media updates to see what exactly will be changed if you run an upgrade check with this command:

cat /var/lib/apt/lists/ppa.launchpad.net_mc3man_trusty-media_*_Packages | grep "Package:" | sort | uniq

If you want to purge it after you have installed vlc then:

sudo ppa-purge ppa:mc3man/trusty-media
sudo apt-get update