Stretch doesn't need puppet package anymore.

preseed/debian/stretch/preseed.cfg

@@ -276,16 +276,6 @@ d-i   apt-setup/non-free                          boolean     true
 d-i   apt-setup/contrib                           boolean     true
 
 # Additional repositories, local[0-9] available
-d-i   apt-setup/local0/repository                 string      \
-       http://apt.puppetlabs.com stretch main dependencies
-#d-i   apt-setup/local0/comment                    string      local server
-# Enable deb-src lines
-d-i   apt-setup/local0/source                     boolean     true
-# URL to the public key of the local repository; you must provide a key or
-# apt will complain about the unauthenticated repository and so the
-# sources.list line will be left commented out
-#d-i   apt-setup/local0/key                        string      http://local.server/key
-d-i   apt-setup/local0/key                        string      http://apt.puppetlabs.com/pubkey.gpg
 
 # By default the installer requires that repositories be authenticated
 # using a known gpg key. This setting can be used to disable that
@@ -298,7 +288,7 @@ tasksel tasksel/first                             multiselect ssh-server standar
 
 ## Individual additional packages to install
 # tftp-hpa to download an archive (see preseed/late_command at the end of this file)
-d-i   pkgsel/include                              string      aptitude tmux puppet zsh tftp-hpa
+d-i   pkgsel/include                              string      aptitude tmux zsh tftp-hpa
 # Whether to upgrade packages after debootstrap.
 # Allowed values: none, safe-upgrade, full-upgrade
 d-i   pkgsel/upgrade                              select      full-upgrade

preseed/debian/stretch/preseed_cinnamon.cfg

@@ -267,16 +267,6 @@ d-i   apt-setup/non-free                          boolean     true
 d-i   apt-setup/contrib                           boolean     true
 
 # Additional repositories, local[0-9] available
-d-i   apt-setup/local0/repository                 string      \
-       http://apt.puppetlabs.com stretch main dependencies
-#d-i   apt-setup/local0/comment                    string      local server
-# Enable deb-src lines
-d-i   apt-setup/local0/source                     boolean     true
-# URL to the public key of the local repository; you must provide a key or
-# apt will complain about the unauthenticated repository and so the
-# sources.list line will be left commented out
-#d-i   apt-setup/local0/key                        string      http://local.server/key
-d-i   apt-setup/local0/key                        string      http://apt.puppetlabs.com/pubkey.gpg
 
 # By default the installer requires that repositories be authenticated
 # using a known gpg key. This setting can be used to disable that
@@ -289,7 +279,7 @@ tasksel tasksel/first                             multiselect ssh-server standar
 
 ## Individual additional packages to install
 # tftp-hpa to download an archive (see preseed/late_command at the end of this file)
-d-i   pkgsel/include                              string      aptitude tmux puppet zsh tftp-hpa
+d-i   pkgsel/include                              string      aptitude tmux zsh tftp-hpa
 # Whether to upgrade packages after debootstrap.
 # Allowed values: none, safe-upgrade, full-upgrade
 d-i   pkgsel/upgrade                              select      full-upgrade

preseed/debian/stretch/preseed_gnome.cfg

@@ -267,16 +267,6 @@ d-i   apt-setup/non-free                          boolean     true
 d-i   apt-setup/contrib                           boolean     true
 
 # Additional repositories, local[0-9] available
-d-i   apt-setup/local0/repository                 string      \
-       http://apt.puppetlabs.com stretch main dependencies
-#d-i   apt-setup/local0/comment                    string      local server
-# Enable deb-src lines
-d-i   apt-setup/local0/source                     boolean     true
-# URL to the public key of the local repository; you must provide a key or
-# apt will complain about the unauthenticated repository and so the
-# sources.list line will be left commented out
-#d-i   apt-setup/local0/key                        string      http://local.server/key
-d-i   apt-setup/local0/key                        string      http://apt.puppetlabs.com/pubkey.gpg
 
 # By default the installer requires that repositories be authenticated
 # using a known gpg key. This setting can be used to disable that
@@ -289,7 +279,7 @@ tasksel tasksel/first                             multiselect ssh-server standar
 
 ## Individual additional packages to install
 # tftp-hpa to download an archive (see preseed/late_command at the end of this file)
-d-i   pkgsel/include                              string      aptitude tmux puppet zsh tftp-hpa
+d-i   pkgsel/include                              string      aptitude tmux zsh tftp-hpa
 # Whether to upgrade packages after debootstrap.
 # Allowed values: none, safe-upgrade, full-upgrade
 d-i   pkgsel/upgrade                              select      full-upgrade

preseed/debian/stretch/preseed_mate.cfg

@@ -267,16 +267,6 @@ d-i   apt-setup/non-free                          boolean     true
 d-i   apt-setup/contrib                           boolean     true
 
 # Additional repositories, local[0-9] available
-d-i   apt-setup/local0/repository                 string      \
-       http://apt.puppetlabs.com stretch main dependencies
-#d-i   apt-setup/local0/comment                    string      local server
-# Enable deb-src lines
-d-i   apt-setup/local0/source                     boolean     true
-# URL to the public key of the local repository; you must provide a key or
-# apt will complain about the unauthenticated repository and so the
-# sources.list line will be left commented out
-#d-i   apt-setup/local0/key                        string      http://local.server/key
-d-i   apt-setup/local0/key                        string      http://apt.puppetlabs.com/pubkey.gpg
 
 # By default the installer requires that repositories be authenticated
 # using a known gpg key. This setting can be used to disable that
@@ -289,7 +279,7 @@ tasksel tasksel/first                             multiselect ssh-server standar
 
 ## Individual additional packages to install
 # tftp-hpa to download an archive (see preseed/late_command at the end of this file)
-d-i   pkgsel/include                              string      aptitude tmux puppet zsh tftp-hpa
+d-i   pkgsel/include                              string      aptitude tmux zsh tftp-hpa
 # Whether to upgrade packages after debootstrap.
 # Allowed values: none, safe-upgrade, full-upgrade
 d-i   pkgsel/upgrade                              select      full-upgrade