Enter Single User Modus on Linux with PCextreme

1. Reboot your server and press the shift and/or Escape key on your keyboard until you get a Grub prompt.

2. Find the line with 'linux16 /boot/vmlinuz-xxxx', and change 'ro' to 'rw', and append 'init=/bin/bash'.

3. Press Ctrl+x to boot the server.