Ttyjfyk

I made a preseed.cfg for a Debian 9.7 netinstall and add it to the initrd on the ISO. There a two things I want to assign manually during installation, the IP address and the hostname. The IP address is not a problem. But the hostname doesn't work. I only get the hostname by dhcp or by the string in the preseed.cfg.
How can I assign the hostname manually during the installation?

#### Contents of the preconfiguration file (for stretch)

d-i debconf/priority string critical


d-i debian-installer/locale string en_US
d-i debian-installer/language string en
d-i debian-installer/country string DE
d-i debian-installer/locale string en_US.UTF-8

# Keyboard selection.
d-i keyboard-configuration/xkb-keymap select de

### Network configuration

# netcfg will choose an interface that has link if possible. This makes it
# skip displaying a list if there is more than one interface.
d-i netcfg/choose_interface select auto

# To pick a particular interface instead:
#d-i netcfg/choose_interface select eth1

# If you prefer to configure the network manually, uncomment this line and
# the static network configuration below.
d-i netcfg/disable_autoconfig boolean true

# If you want the preconfiguration file to work on systems both with and
# without a dhcp server, uncomment these lines and the static network
# configuration below.
#d-i netcfg/dhcp_failed note
#d-i netcfg/dhcp_options select Configure network manually

# Static network configuration.
#
# IPv4 example
#d-i netcfg/get_ipaddress string 192.168.1.18
d-i netcfg/get_netmask string 255.255.255.0
d-i netcfg/get_gateway string 192.168.1.254
d-i netcfg/get_nameservers string 10.5.1.1
d-i netcfg/confirm_static boolean true

# Any hostname and domain names assigned from dhcp take precedence over
# values set here. However, setting the values still prevents the questions
# from being shown, even if values come from dhcp.
#d-i netcfg/get_hostname string unassigned-hostname
#d-i netcfg/get_domain string mydomain.org

# If you want to force a hostname, regardless of what either the DHCP
# server returns or what the reverse DNS entry for the IP is, uncomment
# and adjust the following line.
#d-i netcfg/hostname string

# Disable that annoying WEP key dialog.
d-i netcfg/wireless_wep string

# If non-free firmware is needed for the network or other hardware, you can
# configure the installer to always try to load it, without prompting. Or
# change to false to disable asking.
d-i hw-detect/load_firmware boolean true

### Mirror settings
# If you select ftp, the mirror/country string does not need to be set.
#d-i mirror/protocol string ftp
d-i mirror/country string manual
d-i mirror/http/hostname string http.us.debian.org
d-i mirror/http/directory string /debian
d-i mirror/http/proxy string

# Suite to install.
#d-i mirror/suite string unstable
# Suite to use for loading installer components (optional).
#d-i mirror/udeb/suite string unstable

### Account setup
# Alternatively, to skip creation of a normal user account.
d-i passwd/make-user boolean false

### Clock and time zone setup
# Controls whether or not the hardware clock is set to UTC.
d-i clock-setup/utc boolean true

# You may set this to any valid setting for $TZ; see the contents of
# /usr/share/zoneinfo/ for valid values.
d-i time/zone string Europe/Berlin

# Controls whether to use NTP to set the clock during the install
d-i clock-setup/ntp boolean true
# NTP server to use. The default is almost always fine here.
d-i clock-setup/ntp-server string time.mpicc.de

### Base system installation

### Apt setup
# You can choose to install non-free and contrib software.
d-i apt-setup/non-free boolean true
d-i apt-setup/contrib boolean true

### Package selection
tasksel tasksel/first multiselect standard, ssh-server

### Boot loader installation

# This is fairly safe to set, it makes grub install automatically to the MBR
# if no other operating system is detected on the machine.
d-i grub-installer/only_debian boolean true

# This one makes grub-installer install to the MBR if it also finds some other
# OS, which is less safe as it might not be able to boot that other OS.
d-i grub-installer/with_other_os boolean true

# Due notably to potential USB sticks, the location of the MBR can not be
# determined safely in general, so this needs to be specified:
d-i grub-installer/bootdev string /dev/sda


### Finishing up the installation

# Avoid that last message about the install being complete.
d-i finish-install/reboot_in_progress note


#### Advanced options

d-i preseed/late_command string apt-install sudo