so I ran
free -m to see how much RAM is being used and this was the output
total used free shared buffers cached Mem: 3868 3717 151 0 122 2397 -/+ buffers/cache: 1197 2670 Swap: 3871 0 3871
Now, I'm not sure if I understand this correctly, but does it say that I have only 151MB of RAM available? I ran
gnome-system-monitor afterwards, which shows that 1.2GB being used. Could you enlighten me a bit?