Your Plex repository entry is outdated.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.