Comment 18 for bug 1434753

root@ubuntu-mate:~# ls -la /dev/mapper/
total 0
drwxr-xr-x 2 root root 100 Mar 21 11:02 .
drwxr-xr-x 20 root root 4440 Mar 21 11:02 ..
crw------- 1 root root 10, 236 Mar 21 11:00 control
lrwxrwxrwx 1 root root 7 Mar 21 11:16 ubuntu--mate--vg-root -> ../dm-0
lrwxrwxrwx 1 root root 7 Mar 21 11:02 ubuntu--mate--vg-swap_1 -> ../dm-1

root@ubuntu-mate:~# dmsetup ls --tree
ubuntu--mate--vg-swap_1 (252:1)
 └─ (8:5)
ubuntu--mate--vg-root (252:0)
 └─ (8:5)