W: Failed to fetch http://ppa.launchpad.net/user/ppa-name/ubuntu/dists/natty/main/source/Sources  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/user/ppa-name/ubuntu/dists/natty/main/binary-i386/Packages  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.
silverarrow@silverarrow:~$ apt-cache policy vlc shows the ppa version
vlc:
  Installed: 1.1.11-2~natty
  Candidate: 1.2.0~~git20110524+r650-0~r25~natty1
  Version table:
     1.2.0~~git20110524+r650-0~r25~natty1 0
        500 http://ppa.launchpad.net/videolan/master-daily/ubuntu/ natty/main i386 Packages
 *** 1.1.11-2~natty 0
        500 http://ppa.launchpad.net/chimerarevo/vlc/ubuntu/ natty/main i386 Packages
        100 /var/lib/dpkg/status
     1.1.9-1ubuntu1.3 0
        500 http://no.archive.ubuntu.com/ubuntu/ natty-updates/universe i386 Packages
        500 http://security.ubuntu.com/ubuntu/ natty-security/universe i386 Packages
     1.1.9-1ubuntu1 0
        500 http://no.archive.ubuntu.com/ubuntu/ natty/universe i386 Packages
the:
  Installed: (none)
  Candidate: 3.3~b4-1
  Version table:
     3.3~b4-1 0
        500 http://no.archive.ubuntu.com/ubuntu/ natty/universe i386 Packages
N: Unable to locate package shows
N: Unable to locate package ppa
N: Unable to locate package version
silverarrow@silverarrow:~$ sudo apt-get update vlc
E: The update command takes no arguments
silverarrow@silverarrow:~$