For the recovery mode, the procedure would be something along the lines of : - mount the root (subvolume "@") on /mnt/ - mount the home (subvolume "@home") on /mnt/home/ - bind-mount the few software defined directory (like /proc /sys /dev) into /mnt/home - mount the few other blocks chroot into /mnt/ and try restarting the update and/or checking with zypper/pkgcon if there aren't other problems (packages conflicts).