Simplify

wiki/src/install/inc/steps/install_tails_installer.inline.mdwn

@@ -5,8 +5,8 @@ In this step, you will install <span class="application">Tails
 Installer</span> a program designed specifically for installing Tails.
 <span class="application">Tails Installer</span> is available in:
 
-  - Debian 8 (Jessie) or later as a backport
-  - Ubuntu 14.04 (Trusty) or later in a PPA
+  - Debian 8 (Jessie) or later
+  - Ubuntu 14.04 (Trusty) or later
 
 <div class="caution">