Swap not mounting on a fresh installation

Don't worry!

  1. Format /dev/sda6 to be a valid swap mkswap /dev/sda6
  2. Activate the swap by swapon /dev/sda6
  3. Additionally modify /etc/fstab to make swap start after every boot. The swap line will probably be already there. You will just need to update UUID received as output of step 1.