Почему я получаю эту ошибку при обновлении после частичного обновления?

Мне предложили частичное обновление, и я его завершил. За это VLC был удален. Когда я пытаюсь переустановить его, я получаю это:

isuru@isuru-desktop:~$ sudo apt-get install vlc   
Reading package lists... Done 
Building dependency tree        
Reading state information... Done 
Some packages could not be installed. This may mean that you have requested 
an impossible situation or if you are using the unstable distribution that some 
required packages have not yet been created or been moved out of Incoming. 

The following information may help to resolve the situation:

The following packages have unmet dependencies:   
vlc: 
Depends:
vlc-nox (= 1.1.13-1~ppa1~lucid1) but it is not going to be installed
Recommends: vlc-plugin-notify (= 1.1.13-1~ppa1~lucid1) but it is not going to be installed
Recommends: vlc-plugin-pulse (= 1.1.13-1~ppa1~lucid1) but it is not going to be installed 
E: Broken packages 

isuru@isuru-desktop:~$

sudo apt-get install vlc-nox 
Reading package lists... Done 
Building dependency tree        
Reading state information... Done 
Some packages could not be installed. This may mean that you have requested an
impossible situation or if you are using the unstable distribution
that some required packages have not yet been created or been moved
out of Incoming. 

The following information may help to resolve the situation:

The following packages have unmet dependencies:   
vlc-nox: 
Depends:
libavformat52 (>= 4:0.6-1~) but it is not going to be installed or libavformat-extra-52 (>= 4:0.6-1~) 
E: Broken packages