Hi, I made 4 Test entries and the first entry already worked without an issue: $ grep 1..Test /mnt/m1.xubu20.04/boot/grub/grub.cfg -A4 menuentry "Ubuntu X Moon Studio lowlatency, ro 1. Test root=/dev/disk/by-label/" { search --no-floppy --set=root --label s3.archlinux linux /.boot/ubuntu_moonstudio/boot/vmlinuz-lowlatency root=/dev/disk/by-label/moonstudio230406 ro initrd /.boot/ubuntu_moonstudio/boot/initrd.img-lowlatency } I'm surprised since on Arch Linux I can only boot the kernels v6+. Startup hangs when I try to boot the v4.19+ or 5+ kernels with the new hardware. $ pacman -Q linux{,-rt{-lts,,-cornflower,-pussytoes,-securityink}}|awk '{print $1"\t"$2}' linux 6.2.10.arch1-1 linux-rt-lts 5.15.96.61.realtime1-2 linux-rt 6.2.0.3.realtime1-3 linux-rt-cornflower 1:4.19.271_rt120-0.300 linux-rt-pussytoes 1:4.19.269_rt119-0.300 linux-rt-securityink 1:4.19.265_rt117-0.300 The Ubuntu kernel I booted is way older $ /bin/ls -l /.boot/ubuntu_moonstudio/boot/vmlinuz-lowlatency lrwxrwxrwx 1 root root 28 Apr 21 2021 /.boot/ubuntu_moonstudio/boot/vmlinuz-lowlatency -> vmlinuz-4.4.0-210-lowlatency However, this doesn't matter now. Regards, Ralf