After adding the ppa and apt-getting plexmediaserver, it briefly said something like "running media server". Then disappeared.
root@host:/etc# ps aux |grep -i plex
root 8757 0.0 0.3 4192 752 pts/1 S+ 12:11 0:00 grep --color=auto -i plex
root@host:/etc# lynx --dump http://localhost:32400/manage/index.html
Looking up localhost:32400
Making HTTP connection to localhost:32400
Alert!: Unable to connect to remote host.
lynx: Can't access startfile http://localhost:32400/manage/index.html