What you get from
free
df -h
The install script has detected you have less than 2G of RAM and less than 2G of swap, and is trying to create a swapfile. According to the source, it doesn’t deal with the case where there is an existing swapfile. Probably you should remove the existing swapfile and try again. This might be enough:
swapoff /swapfile && rm /swapfile
free