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I am using plymouth for boot splash and lightdm as display manager on a Debian 9 (stretch) box. My aim is to have a smooth graphical transition from plymouth to lightdm with no console text in between. However, when the machine boots there is a short period of time (about a second or so) when the tty1 console login pops up:

Debian GNU/Linux 9 <hostname> tty1
<hostname> login:

This does not happen when I run Ubuntu on the same hardware. How can I eliminate this switch to text mode in Debian?

EDIT

Configuring lightdm.service to have a negative requirement dependency on getty@tty1.service, i. e. adding the following snippet to the relevant systemd configuration (e. g. /etc/systemd/system/lightdm.service.d/override.conf):

[Unit]
Conflicts=getty@tty1.service

prevents the login prompt (above) to be shown, but it does not solve the problem of temporarily switching to text mode - a blinking underscore symbol (_) appears in the top left corner of the screen for a short time instead.

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