Hi. I tried to install Tumbleweed on a ssd partition (LUKS+LVM) and not boot from that drive (has windows partitions that I don’t want to modify), but boot from a pen drive.
The manual partition and installation worked ok without errors, / is in LUKS+LVM. /boot is in /dev/sda2 and /boot/efi in /dev/sda1, configured boot options to grub in /dev/sda, but when booting from pen drive grub said: no such partition.
If i boot from pen drive rescue, mount the root LUKS+LVM partition in /mnt and other devices, then chroot /mnt, the system is there. but there is some problem with booting from the pen drive. Tried to do the grub2-install and grub2-mkconfig from that chroot, but also didn’t boot properly, always the same error about grub no such partition.
Solved. Several problems at once.
Partitioned the pendrive with MSDOS (was GPT), then boot rescue, open LUKS and LVM, mounted root, /boot and /boot/efi filesystems, in /mnt, also mounted dev, sys, proc and run. Then chrooted to /mnt.
Run the grub2-install and grub2-mkconfig from that environment.
Run efibootmgr to add the opensuse boot manager, and reboot.
Tumbleweed installer also didn’t configure cryptodisk in grub defaults (was “n”, changed to “y”, and also several needed grub modules for crypto and lvm)
Doing the same install was so easy a couple of years ago that all just can be done from the installer. This time it required me to read and refresh a lot of concepts about boot process. I hope it will be easier next one…