This is probably happening after upgrading linux mint from 19.1 to 19.2 tina
$ df -Th Filesystem Type Size Used Avail Use% Mounted on udev devtmpfs 2.7G 0 2.7G 0% /dev tmpfs tmpfs 544M 8.3M 536M 2% /run /dev/sda5 ext4 19G 18G 31M 100% / tmpfs tmpfs 2.7G 74M 2.6G 3% /dev/shm tmpfs tmpfs 5.0M 4.0K 5.0M 1% /run/lock tmpfs tmpfs 2.7G 0 2.7G 0% /sys/fs/cgroup /dev/sda3 fuseblk 94G 69G 25G 74% /mnt/34ADC09A5E6352AC /dev/sda4 fuseblk 112G 78G 35G 70% /mnt/1CEE91ED7C738E10 /dev/sda6 ext4 73G 20G 50G 29% /home tmpfs tmpfs 544M 52K 544M 1% /run/user/1000
sudo timeshift --list
show?