Forgive my inexperience with Linux, but I've attempted to search for my issues but can't find answers.

This started when I saw that my PC doesn't give a dual-boot menu on start up and goes directly to Windows. I found that the answer was to install grub, but when I tried I got

grub-install: error: cannot open `/boot/grub/i386-pc/serial.mod': No space left on device.

I checked GParted and sda1 only has 100MB total space despite having a 500GB hard drive (which is designated as sda2), 60 of which is used. Is this the issue? I am also not able to download anything from online (every download fails). When I first started up I received a low memory warning, but have not been able to see that since. I don't know how much of this is connected but I'm getting the feeling I screwed something up with the installation.

df -h gives

Filesystem Size Used Avail Use% Mounted on

udev 3.8G 0 3.9G 0% /dev

tmpfs 796M 9.5M 787M 1% /run

/dev/sdb1 15G 2.9G

/dev/loop1 1.4G 1.4G

/cow 81M 77M

I also just received a notification: "This computer has only 204.8kB disk space remaining"