Here is the problem, i tried to install phoenix os by this tutorial: https://www.fosslicious.com/2018/07/how-to-install-phoenix-os-on-ubuntu-linux.html and so i created a 30gb .img in /phoenix folder later i decided to delete it, so i deleted the /phoenix folder by moving to trash can and then empty the trash can. The problem is that in Disks they say me that my Ubuntu partition has that 30gb in use. ¿How can i free this space? (sorry my bad english please)