Use gksudo gedit /etc/apt/sources.list
.
Encontre essas linhas nesse arquivo.
#deb http://us.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse
#deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse
#deb http://archive.canonical.com/ubuntu lucid partner
#deb-src http://archive.canonical.com/ubuntu lucid partner
Agora remova o #
para incluir esses repositórios e salve-o. Agora as linhas devem ficar assim:
deb http://us.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse
deb http://archive.canonical.com/ubuntu lucid partner
deb-src http://archive.canonical.com/ubuntu lucid partner
Execute sudo apt-get update
e, em seguida, sudo apt-get install vlc vlc-plugin-* mozilla-plugin-vlc
.