remove explicit apt update commands

build/scripts/multimedia.sh

@@ -1,6 +1,4 @@
 ## Enable multimedia sources in APT
 echo 'deb http://www.deb-multimedia.org stretch main non-free' >> /etc/apt/sources.list
 echo 'deb-src http://www.deb-multimedia.org stretch main non-free' >> /etc/apt/sources.list
-apt update
 apt_install_permanent deb-multimedia-keyring
-apt update

build/scripts/prepare.sh

@@ -18,7 +18,6 @@ export_env INITRD no
 echo 'deb-src http://httpredir.debian.org/debian/ stretch main' >> /etc/apt/sources.list
 echo 'deb http://httpredir.debian.org/debian/ stretch-backports main contrib non-free' >> /etc/apt/sources.list
 echo 'deb-src http://httpredir.debian.org/debian/ stretch-backports main contrib non-free' >> /etc/apt/sources.list
-apt update
 
 ## Fix some issues with APT packages
 # See https://github.com/dotcloud/docker/issues/1024

build/scripts/sabnzbd.sh

@@ -5,7 +5,6 @@ export_env SABNZBD_DATA /host/var/lib/sabnzbd
 ## SABnzbd
 echo 'deb http://ppa.launchpad.net/jcfp/ppa/ubuntu precise main' >> /etc/apt/sources.list.d/sabnzbdplus.list
 echo 'deb http://ppa.launchpad.net/jcfp/nobetas/ubuntu precise main' >> /etc/apt/sources.list.d/sabnzbdplus.list
-apt update
 apt install -f
 apt_install_permanent sabnzbdplus
 

build/scripts/sonarr.sh

@@ -9,6 +9,5 @@ apt-key adv --keyserver keyserver.ubuntu.com --recv-keys FDA5DFFC
 
 ## Sonarr
 echo "deb http://apt.sonarr.tv/ develop main" | tee -a /etc/apt/sources.list
-apt update
 apt_install_permanent nzbdrone
 chmod +x /opt/NzbDrone/NzbDrone.exe