I found a problem during creation of a live USB stick with a ESP to boot from. I have to populate the ESP manual.
Therefor I need to copy the files from /usr/lib/syslinux/efi64/ to the ESP. Althrough syslinux and efibootmgr are installed (checked with apt_cache) the files seem to be not in the standart location.
Hope this question is easier to answer than my previos ones. Thanks in advance for the help.