Here's what happened:
I was messing around with my external hard drive. I used Gparted to add an ext3 partition so that I could boot another distro from it. After finding out that my BIOS didn't allow me to boot from the USB I deleted the ext3 partition, the swap, and the extended partitions, basically returning it to how it was before...or so I thought.
Later, I figured that I could partition my actual hard drive to boot another distro. So I decided to clear up some space by deleting my music and videos (which are all backed up in the external). Then I decided to clean out the external a bit by deleting files I deemed useless. And what happened was that I got a message saying that I didn't have permissions to write to it. I can't modify any of the files in my external in any way.
What I tried:
chown -R leonardo:users /media
I think that I was able to make myself the owner with this command but I still couldn't modify anything. The error message said that it was a read-only file system.
(Attached is a log with the output of the following commands:
fdisk-l
df -f
cat /etc/fstab