I can follow the guide all the way through to here:
root@Sonarr:/tmp# echo “deb xxxs://apt.sonarr.tv/ master main” | sudo tee -a /etc/apt/sources.list
deb xxxs://apt.sonarr.tv/ master main (removed proper url due to new post limit)
root@Sonarr:/tmp# apt-get install nzbdrone
Reading package lists… Done
Building dependency tree
Reading state information… Done E: Unable to locate package nzbdrone
I have exacly the same issue (I am following the same guide and I get an “Unable to locate package nzbdrone” when I try apt-get install nzbdrone). Unfortunatelly, the problem persists after apt-get upgrade.