How do I disable the blank console “screensaver” on Ubuntu Server?

The easiest way is to add the parameter

1	consoleblank=0

to your kernel command-line at boot-time.

Open /etc/default/grub in your favorite editor; you will need to use sudo (for vi, nano, etc.) or gksudo (for gedit, etc.).
Then add consoleblank=0 to the GRUB_CMDLINE_LINUX_DEFAULT=, parameter.
e.g. yours may say:
1
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash consoleblank=0"

Then run sudo update-grub, and reboot.

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