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The output of your command "$ df -h" is:

Filesystem                         Size  Used Avail Use% Mounted on
/dev/mapper/ubuntu--vg-ubuntu--lv  689G   92G  569G  14% /
tmpfs                               12G  252K   12G   1% /dev/shm
tmpfs                              2.4G  4.8M  2.4G   1% /run
tmpfs                              5.0M  8.0K  5.0M   1% /run/lock
tmpfs                              2.4G  112K  2.4G   1% /run/user/131
tmpfs                              2.4G   96K  2.4G   1% /run/user/1000
/dev/sda2                          2.0G  298M  1.5G  17% /boot