2 methods introduced here to boot Linux Mint to console/command line.
Method 1 (may only work for earlier releases; check method 2 below): set kernel option.
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash text"
Then, re-generate grub configuration file:
Method 2: remove mdm.
Linux Mint uses mdm as the display manager. To boot to console (not graphical), you can remove the mdm:
sudo aptitude remove mdm mint-mdm-themes
If you like, you can clean up other stuffs used by mdm (not required though):