Code################################################################# # Installing syslinux to /tmp/installer/part1 ################################################################# /dev/nvme0n1p1: unsupported sectors size(as before) the installer fails to install syslinux to the NVME drive and no bootloader = no boot.
If you have a standard non-fancy drive around you can see if that works (to isolate the issue to NVME vs SATA) but it's likely due to some oddity with NVME drive firmware. I'm unsure what the solution/workaround is with syslinux so install grub to the (otherwise fine) nvme drive instead of syslinux and see what happens.
Google reports there are 387,000 results for "install grub bootloader" so plenty of things to read.
nmve (Toshiba XG3) got 4k sector size. Based on internet search syslinux 6.03 supports 4k sector size, but its official installers don't.
SSD probably also on 4k sectors.