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Preseed Linux USB Create

To create an Auto-Install USB Stock with Mint 21.2 or later, use the following steps.

Download latest Linux Mint iso file https://www.linuxmint.com/edition.php?id=305
Insert USB stick, check with dmesg | tail to identify the usb device
Delete/Create FAT32 partition
```
su -
fdisk /dev/xxx
```
create type c (Win95 FAT32 LBA) partition
See for details: https://askubuntu.com/questions/1064278/how-to-create-win95-fat32-lba-partition-type-on-32-gb-usb
create vfat filesystem on new partition
```
mkfs.vfat /dev/xxx1
```
mount disk
```
mount /dev/xxx1 /mnt
```
rename usb stick label if necessary/desired
```
mlabel -i /dev/xxx1 -s ::"CST_MINT212"
```
mount iso and copy iso content directly to usb stick partition. Ensure hidden files/directories are copied as well.
copy custom_install directory to usb stick root
copy custom preseed files to usb stick preseed directory

edit /boot/grub/grub.cfg and add to end:

menuentry "Install Custom Linux Mint 21.2 Cinnamon 64-bit" {
	set gfxpayload=keep
	linux	/casper/vmlinuz  file=/cdrom/preseed/mint_allinone.seed boot=casper debian-installer/locale=en keyboard-configuration/layoutcode=en_GB console-setup/layoutcode=en_GB automatic-ubiquity quiet splash --
	initrd	/casper/initrd.lz
}

add syslinux.cfg to root with content:

default vesamenu.c32
timeout 100

menu background splash.png
menu title Welcome to Linux Mint Cinnamon 64-bit

menu color screen	37;40      #80ffffff #00000000 std
MENU COLOR border       30;44   #40ffffff #a0000000 std
MENU COLOR title        1;36;44 #ffffffff #a0000000 std
MENU COLOR sel          7;37;40 #e0ffffff #20ffffff all
MENU COLOR unsel        37;44   #50ffffff #a0000000 std
MENU COLOR help         37;40   #c0ffffff #a0000000 std
MENU COLOR timeout_msg  37;40   #80ffffff #00000000 std
MENU COLOR timeout      1;37;40 #c0ffffff #00000000 std
MENU COLOR msg07        37;40   #90ffffff #a0000000 std
MENU COLOR tabmsg       31;40   #ffDEDEDE #00000000 std
MENU WIDTH 78
MENU MARGIN 15
MENU ROWS 7
MENU VSHIFT 10
MENU TABMSGROW 12
MENU CMDLINEROW 12
MENU HELPMSGROW 16
MENU HELPMSGENDROW 29


label custom
menu label Automated installation (Everything in one partition) (syslinux)
kernel casper/vmlinuz
append  file=/cdrom/preseed/mint_allinone.seed boot=casper initrd=/casper/initrd.lz debian-installer/locale=en keyboard-configuration/layoutcode=en_GB console-setup/layoutcode=en_GB automatic-ubiquity quiet splash --
label live
  menu label Start Linux Mint
  kernel /casper/vmlinuz
  append  file=/cdrom/preseed/linuxmint.seed boot=casper initrd=/casper/initrd.lz quiet splash -- persistent
menu default
label xforcevesa
  menu label Start in compatibility mode
  kernel /casper/vmlinuz
  append  file=/cdrom/preseed/linuxmint.seed boot=casper initrd=/casper/initrd.lz noapic noacpi nosplash irqpoll nomodeset --
label oem
  menu label OEM install (for manufacturers)
  kernel /casper/vmlinuz
  append  file=/cdrom/preseed/linuxmint.seed oem-config/enable=true only-ubiquity boot=casper initrd=/casper/initrd.lz quiet splash --
label check
  menu label Integrity check
  kernel /casper/vmlinuz
  append  boot=casper integrity-check initrd=/casper/initrd.lz quiet splash --
label hdt
  menu label Hardware Detection
  kernel hdt.c32
label local
  menu label Boot from local drive
  COM32 chain.c32
  APPEND hd0
label memtest
  menu label Memory test
  kernel /casper/memtest

Finally, proceed with pre-config as per CUSTOM USB INSTALL instructions (to follow)