1. scan system for LVM volumes and identify in the output the volume group name (mine proved to be vg_amd)

$ sudo vgscan    

2. Activate the volume

$ sudo vgchange -ay vg_amd

3. Find the logical volume that has root filesystem (mine proved to be lv_home)

$ sudo lvs

4. Mount it

$ sudo mount /dev/vg_amd/lv_home /media -o ro,user