How can I accept the Microsoft EULA agreement for ttf-mscorefonts-installer?

It's  ⇆ TAB , then return ↵.

:-)

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In general, to navigate ncurses-style menus:

• Use the Tab key to move from one element (e.g., button, text box) to the next. Use Shift+Tab to move in reverse.
• Use Spacebar to "click" the selected button.
• Use Enter to click the default button (or currently selected button, if there is no default).
• You can move up and down in a textbox with the arrow keys, and with Page Up and Page Down. If that doesn't work, press Tab until the text box you want to navigate in is selected.

If you've accidentally said you don't agree to the EULA, and you want a chance to review it again and agree, you can reinstall ttf-mscorefonts-installer, purging its global configuration files:

sudo apt-get --purge --reinstall install ttf-mscorefonts-installer

Normal install, deploying or in scripts

Use debconf to preset the selection. This will not prompt to accept the license:

echo ttf-mscorefonts-installer msttcorefonts/accepted-mscorefonts-eula select true | sudo debconf-set-selections
sudo apt-get install ttf-mscorefonts-installer

With Kickstart

Add this to your Kickstart.cfg file:

preseed --owner ttf-mscorefonts-installer msttcorefonts/accepted-mscorefonts-eula boolean true

You can also accept the license with a single command like this:

echo ttf-mscorefonts-installer msttcorefonts/accepted-mscorefonts-eula select true | debconf-set-selections

This will avoid creating the conf file.

If your using puppet, here is a recipe for installing the package:

class unifocus-context::msfonts {
  exec { "accept-msttcorefonts-license":
    command => "/bin/sh -c \"echo ttf-mscorefonts-installer msttcorefonts/accepted-     mscorefonts-eula select true | debconf-set-selections\""
  }

  package { "msttcorefonts":
    ensure  => installed,
    require => Exec['accept-msttcorefonts-license']
  }
}