In my case, my 15GB root partition is nearly full (btrfs filesystem df /) whereas it only contain 7.5GB of data (du -shx /).
In fact, I just discovered @apt-snapshot-release-upgrade-utopic-2014-10-23_23:24:46 volume (sudo btrfs subvolume list -p /), and I guess it used the other 7.5GB.
So just after dist-upgrading from trusty to utopic, my root volume just goes from 50% full to 99% full.
In my case, my 15GB root partition is nearly full (btrfs filesystem df /) whereas it only contain 7.5GB of data (du -shx /). release- upgrade- utopic- 2014-10- 23_23:24: 46 volume (sudo btrfs subvolume list -p /), and I guess it used the other 7.5GB.
In fact, I just discovered @apt-snapshot-
So just after dist-upgrading from trusty to utopic, my root volume just goes from 50% full to 99% full.