Is there a way to allocate this free space in the sda6? Thx.
"não alocada" = "non allocated"
There is. You have to boot from live USB/CD and open GParted as root:
sudo gparted &
and then select sda6
and Resize/Move to enlarge the partition in to the unallocated space.
Please backup everything before you do that.
Also, I'm not sure what is in sda5
(the thing preceding sda6
) be careful.
More information can be found here.