Filesystem                   Size  Used Avail Use% Mounted on
/dev/mapper/ubuntu--vg-root  103G   20G   79G  20% /
none                         4.0K     0  4.0K   0% /sys/fs/cgroup
udev                         3.4G  4.0K  3.4G   1% /dev
tmpfs                        684M  1.7M  682M   1% /run
none                         5.0M     0  5.0M   0% /run/lock
none                         3.4G  668K  3.4G   1% /run/shm
none                         100M   40K  100M   1% /run/user
/dev/sdb1                    236M  207M   18M  93% /boot