MySQL Crashes on 512MB VPS

My VPS hosting Apache2+MySQL+Wordpress has problems with MySQL frequently. MySQL crashes and does not restart, leading to an inaccessible web site. What I initially found was the changing the Then I figured out that Apache was using 8 processes, consuming all the memory, leaving no memory for MySQL. So In apache2.conf, I changed StartServers from 5 to 2 and MaxClients from 150 to 5 to reduce the memory consumption. StartServers 2 MinSpareServers 5 MaxSpareServers 10 MaxClients 5 MaxRequestsPerChild 0

Samsung ML-2955ND on Ubuntu/Mint Linux

Default drivers does not seem to work. But when you choose 2850-pxlmono driver, it works! Both in local and in network mode. See: http://askubuntu.com/questions/228760/ubuntu-12-04-samsung-ml-2955dw-not-print