Q:

I cant install vlc in ubuntu 14.04

first I typed this: sudo apt-get update
at the end of the progress, this is shown: 
W: Failed to fetch http://ppa.launchpad.net/pcf/miro-releases/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

then I run: sudo apt-get upgrade and sussessfully upgraded. after this, from here, (https://www.videolan.org/vlc/download-ubuntu.html) I run:
sudo apt-get install vlc browser-plugin-vlc

and it also has been installed. Then, I go here(How to install the latest version of VLC (2.1.2) on Ubuntu 12.04?) and run them:
sudo add-apt-repository ppa:videolan/stable-daily
sudo apt-get update && sudo apt-get install vlc
sudo add-apt-repository ppa:videolan/master-daily

when all are done, I tried to open a video file. I chose "open with vlc media player", but nothing happened, I clicked several times, but nothing changed. 
Now please tell me, what should I do? 
ok, thank you so much. I opened a terminal and run "vlc". then it comes. I dont know what it is.
desktop:~$ vlc
VLC media player 2.1.6 Rincewind (revision 2.1.6-0-gea01d28)
[0x8166158] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
[0x81f54c8] skins2 interface error: no suitable dialogs provider found (hint: compile the qt4 plugin, and make sure it is loaded properly)
[0x81f54c8] skins2 interface error: cannot instantiate qt4 dialogs provider
[0x81f54c8] [cli] lua interface: Listening on host "*console".
VLC media player 2.1.6 Rincewind
Command Line Interface initialized. Type `help' for help.
> 

A:

The vlc master ppa is basically dead, no new builds since mid march of the current dev vlc so it's worthless. So remove from sources - 
sudo add-apt-repository -r ppa:videolan/master-daily

The stable ppa is outdated for 14.04 so doesn't matter if you keep or remove, maybe they'll do a new build, maybe not. To remove like above - 
sudo add-apt-repository -r ppa:videolan/stable-daily

Now update your sources - 
sudo apt-get update

Remove vlc completely - 
sudo apt-get purge vlc-data

Re install vlc, either from command below or from software-center
sudo apt-get install vlc

Remove current config for vlc, copy & paste so no mistake with command!
rm -rf ~/.config/vlc

Now vlc should open fine..

