Load hash from YAML with keys as symbols in Ruby

The most easy way is to start keys with colon ':'

:db:
  - :host: db.host.com
    :port: 5210

Now when you load this

db_config = YAML::load(File.open(File.expand_path('../config/database.yml', File.dirname(__FILE__))))

it will be "symbolized"

Ubuntu crash after kernel or Nvidia proprietary drivers updates

How to restore Ubuntu if it crashes after kernel or Nvidia drivers updates

1. Press Ctrl+Alt+T (or Ctrl+Alt+F1) to run terminal
2. Install linux kernel source and headers
   sudo apt-get install linux-source
   sudo apt-get install linux-headers-<kernel version>-generic
3. Remove Nvidia drivers
   sudo apt-get remove nvidia-current
   or
   sudo apt-get remove nvidia-current-updates
   or
   sudo apt-get remove nvidia-experimental-<version>
4. Reinstall Nvidia drivers
   sudo apt-get install nvidia-current-updates
5. Reboot
   sudo -r now