If a system does not boot anymore, it's usually easiest to boot from a live-media and chroot into the installation to troubleshoot the issue at hand. I'll be using the archlinux installation iso to chroot into a debian install to fix a kernel update that's gone sideways. Once in the arch installation, make sure that the disks are all detected: root@archiso ~ # lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS loop0 7:0 0 853.9M 1 loop /run/archiso/airootfs sr0 11:0 1 1.2G 0 rom /run/archiso/bootmnt vda 254:0 0 32G 0 disk ├─vda1 254:1 0 976M 0 part └─vda2 254:2 0 31G 0 part ├─vg_base-lv_root 253:0 0 3.8G 0 lvm ├─vg_base-lv_usr 253:1 0 5.7G 0 lvm ├─vg_base-lv_var 253:2 0 3.8G 0 lvm ├─vg_base-lv_var_log 253:3 0 3.8G 0 lvm ├─vg_base-lv_var_tmp 253:4 0 1.9G 0 lvm ├─vg_base-lv_tmp 253:5 0 488M 0 lvm ├─vg_base-lv_home 253:6 0 976M 0 lvm └─vg_base-lv_...