[Dave400]

Trying to update but I'm getting the following error:

Terminal

WARNING: Less than 30% of free space. Keeping only one single snapshot...
/usr/sbin/btrfs-auto-snapshot: line 456: 100 - (mdu*100 / mdt) : division by 0 (error token is ") ")
Error: root is not existing volume.
/usr/sbin/btrfs-auto-snapshot: line 1: 5706 Segmentation fault exit 138
E: Problem executing scripts DPkg::Pre-Invoke '[ ! -e /etc/default/xbian-snap ] || . /etc/default/xbian-snap; [ $ENABLEDAPT = yes ] || exit 0; z=$(findmnt -n /| awk '{print $2}'); z=${z#*\[\/}; export z=${z%%\/*}; if [ -x /usr/sbin/btrfs-auto-snapshot ]; then btrfs-auto-snapshot snapshot -k $KEEPAPT -l apt-run $z ; fi ;'
E: Sub-process returned an error code

Other than migrating the install to a larger sd card or usb stick is there anything that can trim down used space?