add preseed-file for Linux Mint ISO and a shell script to create a custom Linux Mint ISO

mint/computertruhe.seed

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+# My working preseed file for LinuxMint 18 Cinnamon
+
+d-i	debian-installer/locale string     de_DE
+d-i     localechooser/supported-locales    de_DE.UTF-8
+d-i     keyboard-configuration/xkb-keymap  select de
+d-i     keyboard-configuration/layoutcode  string de
+
+d-i     debian-installer/splash            boolean false
+d-i     console-setup/ask_detect           boolean false
+d-i     console-setup/layoutcode           string de
+d-i     console-setup/variantcode          string
+
+### Partitioning
+# If the system has free space you can choose to only partition that space.
+# This is only honoured if partman-auto/method (below) is not set.
+#d-i partman-auto/init_automatically_partition select biggest_free
+
+# Alternatively, you may specify a disk to partition. If the system has only
+# one disk the installer will default to using that, but otherwise the device
+# name must be given in traditional, non-devfs format (so e.g. /dev/sda
+# and not e.g. /dev/discs/disc0/disc).
+# For example, to use the first SCSI/SATA hard disk:
+#d-i partman-auto/disk string /dev/sda
+# In addition, you'll need to specify the method to use.
+# The presently available methods are:
+# - regular: use the usual partition types for your architecture
+# - lvm:     use LVM to partition the disk
+# - crypto:  use LVM within an encrypted partition
+#d-i partman-auto/method string regular
+
+# You can choose one of the three predefined partitioning recipes:
+# - atomic: all files in one partition
+# - home:   separate /home partition
+# - multi:  separate /home, /var, and /tmp partitions
+#d-i partman-auto/choose_recipe select atomic
+
+#d-i     partman/default_filesystem                     string ext3
+#d-i     partman/choose_partition                       select finish
+
+# If one of the disks that are going to be automatically partitioned
+# contains an old LVM configuration, the user will normally receive a
+# warning. This can be preseeded away...
+#d-i partman-lvm/device_remove_lvm boolean true
+# The same applies to pre-existing software RAID array:
+#d-i partman-md/device_remove_md boolean true
+# And the same goes for the confirmation to write the lvm partitions.
+#d-i partman-lvm/confirm             boolean true
+#d-i partman-lvm/confirm_nooverwrite boolean true
+
+# Just in case, the positive answer to all other imagineable conformation questions:
+#d-i     partman-partitioning/confirm_write_new_label   boolean true
+#d-i     partman/confirm                                boolean true
+#d-i     partman/confirm_nooverwrite                    boolean true
+#d-i     partman/confirm_write_new_label                boolean true
+#d-i     partman-md/confirm                             boolean true
+
+# Time
+d-i     time/zone               string  Europe/Berlin
+d-i     clock-setup/utc         boolean true
+d-i     clock-setup/ntp         boolean true
+d-i     clock-setup/ntp-server  string ntp.ubuntu.com
+
+#   LinuxMint will *demand* a user during installation, ignoring the value
+#   of the passwd/make-user flag, so we need to provide the user data here.
+#   You should not preseed the password in clear text, this is just an example!
+d-i     passwd/user-fullname            string user
+d-i     passwd/username                 string user
+d-i	passwd/user-password-crypted password $6$8Wk7hOnUGc1ffBRY$nefXDPeChvZGK3B/bA4Hzv91sOU8IqmXE4IJATV.BRFtaWJtBQqJKtBQO.e092nf4Jg1.4L2TH5TaLtFy02x1.
+d-i	passwd/user-password-again password $6$8Wk7hOnUGc1ffBRY$nefXDPeChvZGK3B/bA4Hzv91sOU8IqmXE4IJATV.BRFtaWJtBQqJKtBQO.e092nf4Jg1.4L2TH5TaLtFy02x1.
+d-i	passwd/root-login boolean	false
+d-i     user-setup/encrypt-home         boolean false
+d-i	user-setup/allow-password-weak boolean true
+
+
+# Use non-free packages
+ubiquity ubiquity/use_nonfree boolean true

mint/linux_mint_custom_iso.sh

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+#!/bin/bash
+
+#the script needs superuser rights to work correctly for now. 
+#TO DO: maybe there is a way for the script to work as non-root?
+[[ $UID -ne 0 ]] && exec sudo ./"$0"
+
+#creates some folders that are used during the process. These can be changed, but needed be to changed across the script. 
+mkdir /mnt/iso /opt/mintiso
+
+#Downloads latest* mint-iso from the fh-aachen mirror. 
+#TO DO: Maybe there is a way to use a more generic url here? As it stands now the url has to be changed when a new Linux Mint version is released down the line. Maybe variables are a possibility?
+wget http://mirror.bauhuette.fh-aachen.de/linuxmint-cd/stable/19.3/linuxmint-19.3-cinnamon-64bit.iso
+
+#mounts the downloaded iso into a folder. * is added as a wildcard for the version number.
+mount -o loop linuxmint-*-cinnamon-64bit.iso /mnt/iso
+
+#the contents of the iso have to be copied over to another folder, since the ISO is mounted read-only. all the steps below require root. 
+cp -rT /mnt/iso/ /opt/mintiso/
+cd /opt/mintiso/
+
+#copies the computertruhe.seed from codeberg-repo so always the latest preseed-file is used. 
+curl https://codeberg.org/stefan230/Setup-Skripte/raw/branch/master/mint/computertruhe.seed > /opt/mintiso/preseed/computertruhe.seed
+
+#configures the bootloader to use the "custom" computertruhe-preseed. 
+sed -i 's/linuxmint.seed/computertruhe.seed/g' isolinux/isolinux.cfg
+
+#creates the custom-iso with the given parameters.
+#TO DO: the outputpath right now is not generic enough. Maybe find a better name for the iso.  
+mkisofs -D -r -V "UNATTENDED_MINT" -cache-inodes -J -l -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -o /home/stefan/linuxmint-unattended.iso /opt/mintiso
+
+#umounts the iso and clears up the space we used to create the iso.
+umount /mnt/iso
+cd
+rm -r /mnt/iso/
+rm -r /opt/mintiso/
+
+#from here we are basically done and the iso can be "burned" on an USB ready for install. 
+echo "Die Custom ISO wurde fertiggestellt und kann nun verwendet werden. Die ISO ist unter /home/stefan/linuxmint-unattended.iso zu finden."