Hello again mister Aprendiz_de_linux. How is your day today?
Well the answer is easy, you cannot change a partition size if the partition is mounted. You cannot unmount your partition because all your system is using those in order to work.
Do not worry for the words I used becouse your problem is easilly resolvable. All you have to do is to use Gparted from a live CD; because the partitions you want to change size will not be mounted if you run a system from a live CD.
Please, tell me how It goes.
