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The output of your command "$ df -hF ext4" is:

Filesystem                         Size  Used Avail Use% Mounted on
/dev/mapper/ubuntu--vg-ubuntu--lv   98G   11G   83G  12% /
/dev/mapper/ubuntu--vg-lv--0       393G   32G  342G   9% /var
/dev/mapper/ubuntu--vg-lv--1       194G  111G   74G  60% /home