apt-get update not working

Question

guys please help me unable to apt-get update

the output is

20% [9 InRelease gpgv 23.4 kB] [7 Sources 76.5 kB/1,064 kB 7%] [Waiting for heaSplitting up /var/lib/apt/lists/partial/www.plexapp.com_repo_dists_lucid_InReleasIgn hp://ww.plexapp.com lucid InRelease                                     
E: GPG error: http://www.plexapp.com lucid InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)
draguve@Patil-Server:~$ 

Full Output : https://justpaste.it/hajh

Solution

Your Plex repository entry is outdated. Download the new package from the Plex site and install it.

If you can't do that for some reason, update it manually. I checked the Ubuntu package for Plex (current version: 0.9.9.14.531-7eef8c6). They may have used http://plexapps.com as their repository in the past, but at some point they swicthed to a different mirror. The contents of the sources.list.d list file in the package is:

deb http://plex.r.worldssl.net/PlexMediaServer/ubuntu-repo lucid main

Presumably both repositories were active for some time, but now the first one isn't. You should disable the first and enable the new one:

sudo mv $(grep -l 'www.plexapp.com' /etc/apt/sources.list.d/*.list){,.bak}
sudo tee /etc/apt/sources.list.d/plexmediaserver.list <<EOF
deb http://plex.r.worldssl.net/PlexMediaServer/ubuntu-repo lucid main
EOF

This should fix your problem with Plex.

NOTE: It seems they use lucid for all Ubuntu packages. So do not take that as an indication that the packages are meant only for Ubuntu 10.04.