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You need to add swap: <a href=“https://digitalocean.com/community/articles/how-to-add-swap-on-ubuntu-12-04”>How To Add Swap on Ubuntu 12.04</a>. WordPress is also best optimized with Nginx and caching. So, it’s advisable to check out (i) memcache; (ii) APC; (iii) varnish; and (iv) the W3 Total Cache plugin – in addition to switching to Nginx.
@Ibranhim, did you manage to fix it? we got the same problem here with an wordpress installation… :/