This is because 8.6G is too small to allocate 1GB of swap space when /home is installed on a separate partition.
I tried with a 30GB disk drive and 1GB of RAM and 1GB of swap space is allocated.
However, I confirm that with the default drive size in virtualbox (8.6GB) the swap space is only 333MB and there's no warning that less swap space than RAM available is allocated.
This is because 8.6G is too small to allocate 1GB of swap space when /home is installed on a separate partition.
I tried with a 30GB disk drive and 1GB of RAM and 1GB of swap space is allocated.
However, I confirm that with the default drive size in virtualbox (8.6GB) the swap space is only 333MB and there's no warning that less swap space than RAM available is allocated.