The official minimum for any of the 6.9+ releases is 2GB RAM. The functional minimum is 4GB. You're just not going to be able to use the OS with 1GB as anything more than a pure file server (if it works at all), so I don't really get why you would require a swapfile to begin with. This isn't a "software" issue, but rather a "hardware" issue. You're not meeting the minimum requirements.