Disk free space “df” includes Snap virtual drives. Listing actual hard drive partitions is accomplished with “grep”.
Find only Ext4 and FUSE drives:
df -hT | grep -E "ext4|fuseblk"
Exclude “tmpfs” and “snap” virtual drives:
df -hT | grep -vE "squashfs|tmpfs"
As Snap packages update, old versions are left behind. Find Snap packages with multiple versions by examining output of:
df -t squashfs | sort -k6
/snap/slack/7 are installed.
Remove the old Slack Snap version:
snap remove slack --revision=6
Find drive types: