PREUN

/bin/sh

if [ -x /usr/sbin/bootloader-config ]; then
    /usr/sbin/bootloader-config --action remove-entry --label memtest
fi

POSTIN

/bin/sh

if [ -x /usr/sbin/bootloader-config ]; then
    /usr/sbin/bootloader-config --action add-entry --label memtest --image /boot/memtest.bin
fi