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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   15G   79G  16% /
/dev/mapper/ubuntu--vg-lv--0       393G   21G  352G   6% /var
/dev/mapper/ubuntu--vg-lv--1       194G   77G  108G  42% /home