You have almost no free memory and no swap.
physical 3523172k(135048k free), swap 0k(0k free)
The simplest solution is to add some swap space, I suggest 4 GB minimum, up to 16 GB.
To create a Swap file of 2G
sudo dd if=/dev/zero of=/swapfile count=2048 bs=1MiBsudo chmod 600 /swapfilesudo mkswap /swapfilesudo swapon /swapfile
sudo nano /etc/fstab
add this line:/swapfile swap swap sw 0 0
/swapfile swap swap sw 0 0
run swapon --show and free -h to verify
swapon --show
free -h